You are a desktop support technician for your company. All client computers run Windows XP Professional. Your company uses a third-party virtual private network (VPN) device that is not configured to accept IPSec VPN connections.

A user reports that every time she attempts to remotely connect to the company network, she receives the following error message.
You discover that she used the New Connection Wizard on her computer to create a VPN connection to the company network. The user then changed some of the VPN connections settings.

You need to ensure that the user can always establish a VPN connection to the company’s VPN device.

What should you do?

A.
Instruct the user to select PPTP VPN as the type of VPN on the VPN connection properties page.

B.
Instruct the user to select the Use preshared key for authentication check box in the IPSec settings on the VPN connection properties page.

C.
Ask an administrator to create additional PPTP ports on the VPN device.

D.
Ask an administrator to install a computer certificate from your company’s certification authority (CA) on the VPN device.