Your network contains an Active Directory domain named contoso.com. The domain contains a server named Server1 that runs Windows Server 2012 R2.
Server1 has the following role services installed:
DirectAccess and VPN (RRAS)
Network Policy Server
Remote users have client computers that run either Windows XP, Windows 7, or Windows 8.
You need to ensure that only the client computers that run Windows 7 or Windows 8 can establish VPN connections to Server1.
What should you configure on Server1?
A. A condition of a Network Policy Server (NPS) network policy
B. A constraint of a Network Policy Server (NPS) network policy
C. a condition of a Network Policy Server (NPS) connection request policy
D. A vendor-specific RADIUS attribute of a Network Policy Server (NPS) connection request policy
