Your network contains an Active Directory forest. The forest contains the member servers
configured as shown in the following table.

All servers run Windows Server 2008 R2. You deploy a new server named Server1. You need to
configure Server1 to provide central authentication for all dial-up connections and all VPN
connections. What should you install on Server1?

A.
Active Directory Lightweight Directory Services (AD LDS)

B.
Active Directory Federation Services (AD FS)

C.
Network Policy Server (NPS)

D.
Routing and Remote Access service (RRAS)

Explanation:

Ref:

http://www.windowsnetworking.com/articles_tutorials/understanding-new-windows-server-2008-
network-policy-server.html