Your network contains an internal network and a perimeter network. The internal network contains an Active Directory forest. The forest contains a single domain.  You plan to deploy 10 Edge Transport servers on the perimeter network.  You need to recommend a solution for the Edge Transport server deployment. The solution must meet the following requirements： .Allow administrators to apply a single security policy to all Edge Transport servers .Reduce the administrative overhead that is required to manage servers .Minimize the attack surface of the internal network  What should you recommend？（）

• A、Implement Network Policy and Access Services （NPAS）.
• B、Implement Active Directory Federation Services （AD FS）.
• C、Create a new Active Directory domain in the internal forest， and then join all Edge Transport servers to the new domain.
• D、Create an Active Directory forest in the perimeter network， and then join all Edge Transport servers to the new domain.