Your corporate network has a member server named RAS1 that runs windows server 2008. You configure RAS1 to use the routing and remote access service (RRAS). The companys 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?（）
- AInstall the network policy server (NPS) on the RAS1 server.
- BCreate a remote access policy that requires users to authenticate by using SPAP.
- CCreate a remote access policy that requires uses to authenticate by using EAP-TLS.
- DCreate a remote access policy that requires uses to authenticate by using MS-CHAPv2.