You have a VPN server that runs Windows Server 2003 Service Pack 2 (SP2).The VPN server supports only PPTP connections.A firewall protects the VPN server from the Internet.

From a remote computer connected to the Internet, you attempt to connect to the VPN server.

During the connection attempt, you receive a message that your user name and password are being verified.You then receive the following error message: “Error 721: The remote computer is not responding.”

You need to ensure that you can establish a VPN connection to the VPN server from the Internet.

What should you do?

A.
On the VPN server, enable LAN routing.

B.
On the VPN server, create a demand-dial interface.

C.
On the firewall, allow inbound connections that use TCP port 1701.

D.
On the firewall, allow inbound connections that use Generic Route Encapsulation (GRE) protocol 47.