Your network contains a server that runs Windows Server 2008. The server has the Network Policy and Access Services server role installed.You need to allow only members of a global group named Group1 VPN access to the network. What should you do？ （）

• A、Add Group1 to the RAS and IAS Servers group.
• B、Add Group1 to the Network Configuration Operators group.
• C、Create a new network policy and define a group-based condition for Group1. Set the access permission of the policy to Access granted. Set the processing order of the policy to 1.
• D、Create a new network policy and define a group-based condition for Group1. Set the access permission of the policy to Access granted. Set the processing order of the policy to 3.