What should you configure on Server1?

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

Explanation:
If you want to configure the Operating System condition, click Operating System, and then
click Add. In Operating System Properties, click Add, and then specify the operating system
settings that are required to match the policy.
The Operating System condition specifies the operating system (operating system version or
service pack number), role (client or server), and architecture (x86, x64, or ia64) required for
the computer configuration to match the policy.