To answer this question, we need to understand the concept of regression testing.
Regression testing is performed to ensure that previously developed and tested software still performs correctly after it has been changed or interfaced with other software. When selecting test cases for regression testing, it is important to consider various factors such as bug fixes, frequent defects, and recent code changes.
Let's go through each option to understand why it is correct or incorrect:
Option A) Requires knowledge on the bug fixes and how it affects the system - This option is correct because having knowledge about the bug fixes and how they affect the system is crucial in selecting the appropriate test cases for regression testing. This ensures that the fixed bugs have not introduced any new issues.
Option B) Includes the area of frequent defects - This option is correct because selecting test cases from the areas that have previously experienced frequent defects helps in identifying if any regression issues have occurred in those areas.
Option C) Includes the area which has undergone many/recent code changes - This option is correct because areas that have undergone many or recent code changes are more likely to introduce regression issues. Therefore, selecting test cases from these areas helps in detecting any regression defects.
Option D) All of the above - This option is correct because all the options mentioned above are valid considerations when selecting test cases for regression testing. Considering bug fixes, areas of frequent defects, and areas with recent code changes collectively helps in ensuring effective regression testing.
The correct answer is D) All of the above. This option is correct because all the mentioned factors are important considerations when selecting test cases for regression testing.