Which of the following rules is necessary to support this implementation?

A system administrator is implementing a firewall ACL to block specific communication to and from a
predefined list of IP addresses, while allowing all other communication. Which of the following rules is
necessary to support this implementation?

A.
Implicit allow as the last rule

B.
Implicit allow as the first rule

C.
Implicit deny as the first rule

D.
Implicit deny as the last rule