Which three of these options are some of the best practices when you implement an effective firewall security policy?

Which three of these options are some of the best practices when you implement an effective firewall security policy? (choose three)

A.
position firewalls at a strategic inside locations to help mitigate nontechnical attacks

B.
configure logging to capture all events for forensic purposes

C.
use firewalls as a primary security defense; other security measures and devices shoulde be

D.
position firewalls at key security boundeeries

E.
deny all traffic by default and permit only necessary services

Explanation:
implemented to enhance your network security