You are the firewall administrator for your company and you have just learned that the Server administrators are gearing up support an L2TP based VPN solution. You are told to be sure that your firewall rule sets will not hinder the performance of the VPN. Which port, from the following list, will you have to allow through the firewall?

A.
TCP 1701

B.
UDP 1701

C.
TCP 443

D.
UDP 443

E.
TCP 1601