Which one of these statements best describes the role of a proxy server?

A.
An intermediary that acts as both a server and a client for the purpose of making requests on
behalf of other clients.
B.
An intermediary that extracts the destination IP address of a packet, selects the best path for
the packet, and forwards the packet to the next device in the path.
C.
An intermediary that protects the resources of a private network from users on other networks.
D.
An intermediary that inspects traffic in Layers 2-4 and denies or permits it based on a set of
policies.
Explanation:
Answer should be A
answer is A, not D
yes correct answer is A
Correct answer is D