Final answer:
D. A forward proxy server intercepts internal user requests and processes them on behalf of the users, improving security and efficiency.
Step-by-step explanation:
The device that intercepts internal user requests and processes them on behalf of the users is a forward proxy server. It acts as an intermediary between the clients and the internet, forwarding the requests from internal users to external servers. It helps improve security and efficiency by caching requested content and controlling access to certain websites or resources.
A forward proxy server receives the requests from internal users, processes them, and then sends them to the appropriate external server. It can also handle authentication and filtering, allowing organizations to enforce policies regarding internet usage.
An example of a forward proxy server is Squid Proxy Server, which is often used in organizations to manage internet traffic and provide additional security features.