An administrator wants to block users from accessing a few inappropriate websites as soon as possible. The existing firewall allows blocking by IP address. To achieve this goal the administrator will need to:

A.
upgrade to a DNS based filter to achieve the desired result.

B.
use the company AUP to achieve the desired result.

C.
upgrade to a URL based filter to achieve the desired result.

D.
upgrade to a text based filter to achieve the desired result.