One of the firewall choices you are thinking of implementing, in your network, is a proxy server. A
proxy server can accomplish which of the following statements?

A.
Cache web pages for increased performance

B.
Operate at the Application layer of the OSI model

C.
Allow direct communication between an internal and external host

D.
Permit or deny traffic based upon type of service

E.
Filter executables that are attached to an e-mail