Which of the following ports must be opened on the firewall for the VPN connection using the Point-to-Point Tunneling Protocol (PPTP)?

Which of the following ports must be opened on the firewall for the VPN connection using the Point-to-Point Tunneling Protocol (PPTP)?

A.
TCP port 53

B.
TCP port 443

C.
TCP port 563

D.
TCP port 1723