Your network contains an Active Directory forest. The forest contains two domains named contoso.com and fabrikam.com. The functional level of the forest and the domains is Windows Server 2008 R2.
You have a global group named Group1 in the contoso.com domain. Group1 contains the user accounts in contoso.com.
You need to ensure that you can add the user accounts in the fabrikam.com domain to Group1.
What should you do?
A . Raise the domain functional level of contoso.com to Windows Server 2016.
B . Assign the Domain Controllers group in fabrikam.com permissions to Group1.
C . In both domains, run the adprep.exe command and specify the /domainprep parameter.
D . Modify the scope of Group1 to Universal.
Answer: A