You work as a Network Administrator for PassGuide Inc. You have implemented a firewall on the company’s network. You want to ensure that outside users cannot access the internal FTP servers on the network. What will you do to accomplish the task?

A.
Block the TCP ports 20 and 21 on the firewall.

B.
Block the TCP port 443 on the firewall.

C.
Block the TCP port 80 on the firewall.

D.
Block the UDP port 1701 and TCP port 1723 on the firewall.