To answer this question, you need to understand the concept of equivalence classes and boundaries.

Equivalence classes are groups of input values that are expected to produce similar results. In this case, the valid equivalence classes for the stock control system are:

1. Numbers between 10000 and 99999 (inclusive)
2. Numbers less than 10000
3. Numbers greater than 99999

Boundaries, on the other hand, are the points where the behavior of the system might change. In this case, the boundaries are:

1. The minimum value: 10000
2. The maximum value: 99999

Now let's go through each option to determine which ones include valid equivalence classes and valid boundaries:

Option A) 1000, 5000, 99999 - This option includes a number less than 10000 (1000), which is a valid equivalence class. However, it does not include the maximum value of 99999, which is a valid boundary.

Option B) 9999, 50000, 100000 - This option includes a number less than 10000 (9999) and a number greater than 99999 (100000), which are valid equivalence classes. However, it does not include the maximum value of 99999, which is a valid boundary.

Option C) 10000, 50000, 99999 - This option includes numbers from the valid equivalence class (10000, 50000, 99999) and both the minimum and maximum values (10000 and 99999), which are valid boundaries. Therefore, option C is correct.

Option D) 10000, 99999 - This option includes numbers from the valid equivalence class (10000, 99999) and both the minimum and maximum values (10000 and 99999), which are valid boundaries. Therefore, option D is also correct.

The correct answer is option C. This option includes both valid equivalence classes and valid boundaries.

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• Wrong explanation

To answer this question, we need to understand the concept of risk-based testing.

In a risk-based approach, the risks identified are used to make decisions regarding testing. Let's go through each option to understand why it is correct or incorrect:

Option A) ii is True; i, iii, iv & v are False - This option is incorrect because it states that only option ii is true, and all other options are false. However, options i and iii are actually true in a risk-based approach.

Option B) i, ii, iii are true and iv is false - This option is correct. In a risk-based approach, the risks identified are used to determine the test technique to be employed (i), determine the extent of testing to be carried out (ii), and prioritize testing in an attempt to find critical defects as early as possible (iii). However, determining the cost of the project (iv) is not directly related to the risks identified.

Option C) ii & iii are True; i, iv are False - This option is incorrect because it states that options ii and iii are true, but options i and iv are false. However, option i is actually true in a risk-based approach.

Option D) ii, iii & iv are True; i is false - This option is incorrect because it states that options ii, iii, and iv are true, but option i is false. However, option i is actually true in a risk-based approach.

The correct answer is B. Options i, ii, and iii are true in a risk-based approach, while option iv is false.

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) i, ii, iii is true and iv is false:

• i) Interaction with the Test Tool Vendor to identify the best ways to leverage the test tool on the project: This is a task of a tester as they may need to collaborate with the test tool vendor to understand how to utilize the tool effectively.
• ii) Prepare and acquire Test Data: This is also a task of a tester as they need to ensure that appropriate test data is available for testing.
• iii) Implement Tests on all test levels, execute and log the tests: This is a task of a tester as they are responsible for implementing tests, executing them, and logging the results.
• iv) Create the Test Specifications: This option is marked as false, but it is incorrect. Creating test specifications is also a task of a tester.

Option B) ii, iii, iv is true and i is false:

• ii) Prepare and acquire Test Data: This is a task of a tester as they need to ensure that appropriate test data is available for testing.
• iii) Implement Tests on all test levels, execute and log the tests: This is a task of a tester as they are responsible for implementing tests, executing them, and logging the results.
• iv) Create the Test Specifications: This is a task of a tester as they need to create test specifications to define the scope, objectives, and requirements of the tests.
• i) Interaction with the Test Tool Vendor to identify the best ways to leverage the test tool on the project: This option is marked as false, which is correct. Testers may interact with the test tool vendor, but it is not their primary task.

Option C) i is true and ii, iii, iv are false:

• i) Interaction with the Test Tool Vendor to identify the best ways to leverage the test tool on the project: This option is marked as true, which is incorrect. While testers may interact with the test tool vendor, it is not their primary task.
• ii) Prepare and acquire Test Data: This is marked as false, which is incorrect. Testers are responsible for preparing and acquiring test data.
• iii) Implement Tests on all test levels, execute and log the tests: This is marked as false, which is incorrect. Testers are responsible for implementing tests, executing them, and logging the results.
• iv) Create the Test Specifications: This is marked as false, which is incorrect. Testers are responsible for creating test specifications.

Option D) iii and iv is correct and i and ii are incorrect:

• iii) Implement Tests on all test levels, execute and log the tests: This option is marked as correct, which is true. Testers are responsible for implementing tests, executing them, and logging the results.
• iv) Create the Test Specifications: This option is marked as correct, which is true. Testers are responsible for creating test specifications.
• i) Interaction with the Test Tool Vendor to identify the best ways to leverage the test tool on the project: This is marked as incorrect, which is true. While testers may interact with the test tool vendor, it is not their primary task.
• ii) Prepare and acquire Test Data: This is marked as incorrect, which is true. Testers are responsible for preparing and acquiring test data.

The correct answer is B) ii, iii, iv is true and i is false. These options correctly represent the tasks of a tester.

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• Wrong explanation