You need to ensure that Server1 can authenticate users from Active Directory by using Windows authentication

Your network contains an Active Directory domain named contoso.com. An administrator named
Admin1 plans to install the Routing and Remote Access service (RRAS) role service on a server
named Server1. Admin1s user account is not a member of the Domain Admins group. You need to
ensure that Server1 can authenticate users from Active Directory by using Windows authentication.
What should you do?

A.
Install the Active Directory Lightweight Directory Services (AD LDS) role on Server1.

B.
Add the computer account for Server1 to the RAS and IAS Servers group.

C.
Install the Network Policy Server (NPS) role service on a domain controller.

D.
Add the computer account for Server1 to the Windows Authorization Access Group.

Explanation:
Not sure if I am right on this one, since not all question is shown ;)) But I guess that after adding the
role by the Admin1 it says that he is not in Domain Admins group and RRAS server wont be added

automatically to the RAS and IAS group, so it has to be added manualy by a member of that group so
server could authenticate users.