You have a computer that runs Windows Vista. You create a virtual private network (VPN) connection between the computer and your company’s network. You notice that while the computer is connected through the VPN connection, users on the company network can access shared folders on the computer. You need to prevent network users from accessing your shared folders when you are connected to the company’s network by using the VPN connection. What should you do?（）

• A、A
• B、B
• C、C
• D、D