1. What is the primary different between a proxy and a firewall? (A) A proxy allows access, while a firewall denies access. (B) A firewall uses a hardened operating system, while a proxy does not. (C) A proxy makes application-level requests on behalf of internal users, while a firewall typically just passes through authorized traffic. (D) A firewall is capable of successfully performing Network Address Transaction for internal clients, while a proxy is forced to reveal internal addressing schemes.