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

Option A) An application layer will contain business logic - This option is correct because the application layer is responsible for implementing the business logic of an application. It handles the processing and manipulation of data to perform the specific tasks and functions required by the application.

Option B) An application layer manages connections to the database - This option is incorrect because managing connections to the database is typically handled by the data access layer or the database management system itself. The application layer interacts with the data access layer to retrieve or update data from the database, but it does not directly manage the connections.

Option C) An application layer can be distributed over many computers - This option is correct. In a distributed application architecture, the application layer can be divided into multiple components or services that run on different computers. This allows for scalability, fault-tolerance, and workload distribution.

Option D) Both a and b - This option is incorrect because option B is incorrect. The application layer does not manage connections to the database.

Option E) All of the above - This option is correct because both option A and option C are correct. The application layer contains business logic and can be distributed over many computers.

Therefore, the correct answer is E) All of the above.

• Thanks
• Wrong explanation

To answer this question, let's understand the three-tier architecture first.

Three-tier architecture is a client-server architecture that separates the presentation layer, application logic layer, and data storage layer into three separate tiers. Each tier performs a specific function and communicates with the other tiers to provide a complete system.

The three tiers are as follows:

1. Presentation tier: This is the topmost tier that interacts directly with the user and provides the user interface. It includes devices such as computers, smartphones, tablets, etc.

2. Application logic tier: This tier contains the business logic and application processing. It handles the user requests from the presentation tier and interacts with the data storage tier to retrieve or store data. It typically consists of one or more servers.

3. Data storage tier: This tier is responsible for storing and managing data. It can include databases, file systems, or any other data storage mechanism.

Now, coming back to the question, the minimum number of computers in a three-tier architecture is 1. This is because the presentation tier can be a single computer or device, such as a computer or smartphone, that interacts directly with the user. The other tiers (application logic and data storage) can be hosted on the same computer or on separate computers.

Let's go through each option to understand why it is correct or incorrect:

Option A) 1 - This option is correct because the presentation tier can be a single computer or device.

Option B) 2 - This option is incorrect because it implies that there are two computers in the three-tier architecture, which is not necessary. The minimum number is 1.

Option C) 3 - This option is incorrect because it implies that there are three computers in the three-tier architecture, which is not necessary. The minimum number is 1.

Option D) 4 - This option is incorrect because it implies that there are four computers in the three-tier architecture, which is not necessary. The minimum number is 1.

The correct answer is A) 1. This option is correct because the minimum number of computers in a three-tier architecture is 1, as the presentation tier can be a single computer or device.

• Thanks
• Wrong explanation