Your network consists of a single Active Directory domain. All servers run Windows Server 2003 Service Pack 2 (SP2). You have a VPN server named Server1. You have an Internet Authentication Service (IAS) server named Server2. You need to ensure that all VPN connections to Server1 are authenticated by Server2.  Which two actions should you perform?（）

• A、From the Internet Authentication Service snap-in on Server2， create a new RADIUS client.
• B、From the Internet Authentication Service snap-in on Server2， create a new remote access policy.
• C、From the Routing and Remote Access snap-in， configure Server1 to use RADIUS accounting.
• D、From the Routing and Remote Access snap-in， configure Server1 to use RADIUS authentication.