Which tool should you use?

Your network contains an Active Directory forest named contoso.com. The forest contains six domains.

You need to ensure that the administrators of any of the domains can specify a user principal name (UPN) suffix oflitwareinc.com when they create user accounts by using Active Directory Users and Computers.

Which tool should you use?

A.
Active Directory Administrative Center

B.
Set-ADDomain

C.
Active Directory Sites and Services

D.
Set-ADForest

Explanation:
Creating a UPN Suffix for a Forest

This topic explains how to use the Active Directory module for Windows PowerShell to create a new user principal name (UPN) suffix for the users in a forest. Creating an additional UPN suffix helps simplify the names that are used to log on to another domain in the forest.

he following example demonstrates how to create a new UPN suffix for the users in the Fabrikam.com forest:

Set-ADForest -UPNSuffixes @{Add=”headquarters.fabrikam.com”}

http://technet.microsoft.com/en-us/library/dd391925%28v=ws.10%29.aspx