What type(s) of firewalls provide(s) the greatest degree of protection and control because both firewall technologies inspect all seven OSI layers of network traffic?

A. A first-generation packet-filtering firewall

B. A circuit-level gateway

C. An application-layer gateway, or proxy firewall, and stateful-inspection firewalls

D. An application-layer gateway, or proxy firewall, but not stateful-inspection firewalls

Explanation:

An application-layer gateway, or proxy firewall, and stateful-inspection firewalls provide the greatest degree of protection and control because both firewall technologies inspect all seven OSI layers of network traffic.