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.