Your corporate network has a member server named RAS1 that runs Windows Server 2008 R2. You configure RAS1 to use the Routing and Remote Access Services (RRAS). The companyˉs remote access policy allows members of the Domain Users group to dial in to RAS1. The company issues smart cards to all employees. You need to ensure that smart card users are able to connect to RAS1 by using a dial-up connection. What should you do？（）

• A、Install the Network Policy Server (NPS) server role on RAS1.
• B、Create a remote access policy that requires users to authenticate by using SPAP.
• C、Create a remote access policy that requires users to authenticate by using EAP-TLS.
• D、Create a remote access policy that requires users to authenticate by using MS-CHAP v2.