To answer this question, the user needs to be familiar with the concept of the OSI model and its layers.

A fat client is a type of client-server architecture where the majority of data processing occurs on the client-side. In this architecture, the client is responsible for most of the application logic, data storage, and processing.

Now, let's go through each option and determine if it's the correct answer:

A. Application: This layer is responsible for providing access to the network for applications. It includes protocols such as HTTP, SMTP, and FTP. While a fat client may have an application layer, it is not exemplified by this layer.

B. Association: This is not a layer in the OSI model, so it cannot be the correct answer.

C. Data: This layer is responsible for the reliable transfer of data between two nodes on a network. It includes protocols such as TCP and UDP. While a fat client may use these protocols, it is not exemplified by this layer.

D. Logical: This layer is responsible for ensuring that data is transmitted error-free between devices on the network. It includes protocols such as IP and ICMP. While a fat client may use these protocols, it is not exemplified by this layer.

E. Presentation: This layer is responsible for transforming data into a form that is readable by the application layer. It includes protocols such as SSL and TLS. A fat client is exemplified by the Presentation layer because it performs most of the application logic and data processing.

Therefore, the correct answer is:

The Answer is: E