Which of the following is not true of application-level proxy firewalls?

A.
Provide a higher level of protection than circuit-level firewalls

B.
Hide network information from external entities

C.
One proxy per service is needed

D.
Improve network performance

Explanation:
Because application-level proxy firewalls work at such an intricate
level, they typically reduce the overall network performance. Application-level
proxy firewalls look at the data payload to make access decisions and can detect
malicious code and commands, while the other firewall types cannot.