Your network contains one Active Directory domain. You have a member server named Server1 that runs Windows Server 2008 R2. The server has the Routing and Remote Access Services role service installed.You implement Network Access Protection (NAP) for the domain.You need to configure the Point-to-Point Protocol (PPP) authentication method on Server1. Which authentication method should you use？（）
- A Challenge Handshake Authentication Protocol (CHAP)
- B Extensible Authentication Protocol (EAP)
- C Microsoft Challenge Handshake Authentication Protocol version 2 (MS-CHAP v2)
- D Password Authentication Protocol (PAP)