When managing access control lists (ACLs) for firewalls is best practice to:

a. Black list users by maintaining an ACL of users who explicitly cannot access the network, and allow all

others.

b. White list users by maintaining an ACL of users who are explicitly allowed to access the network, and

block all other users.

c. Do not maintain ACLs because they are difficult to manage.

d. Maintain ACLs for privileged (admin) accounts only.