What is true about 3-tier architecture?a.Extremely efficient and has zero client development.b.Middleware layer contains the integration logic.c.Not allowed to distribute application layer across multiple nodes.d.Resource Management Layer only contains the Database.

The correct answer is b. Middleware layer contains the integration logic.

Here's why:

a. 3-tier architecture is not necessarily extremely efficient and has zero client development. The efficiency of a 3-tier architecture depends on various factors such as the complexity of the application, the load on the server, the efficiency of the database design, etc. Also, client development is required in a 3-tier architecture as the presentation layer (client tier) needs to be developed to interact with the users.

b. In a 3-tier architecture, the middleware layer, also known as the logic tier or business logic layer, contains the integration logic. This layer controls the application’s functionality by performing detailed processing.

c. It is not true that the application layer is not allowed to be distributed across multiple nodes in a 3-tier architecture. In fact, one of the advantages of a 3-tier architecture is that it allows for distribution of components across multiple servers or locations, which can improve performance and scalability.

d. The resource management layer in a 3-tier architecture does not only contain the database. It also includes other resources like connectivity and security services.