To solve this question, the user needs to know about the layers of the OSI (Open Systems Interconnection) model, which is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology.

The layer exemplified by a web server is the Application layer, which is responsible for providing network services to the end-user applications. This layer provides services to the software applications that run on top of the network, such as web browsers (e.g., Chrome, Firefox), email clients (e.g., Outlook, Thunderbird), and file transfer clients (e.g., FTP, SFTP).

Now, let's go through each option and explain why it is right or wrong:

A. Application: This option is correct because a web server is an application that provides network services to other applications.

B. Association: This option is incorrect because there is no layer in the OSI model called Association.

C. Data: This option is incorrect because the Data layer is responsible for providing reliable end-to-end transmission of data between two devices.

D. Logical: This option is incorrect because the Logical layer (also known as the Network layer) is responsible for routing data between different networks.

E. Presentation: This option is incorrect because the Presentation layer is responsible for translating, encrypting, or compressing the data into a format that can be understood by the Application layer.

Therefore, the answer is: A. Application.