Your network contains an Active Directory forest named contoso.com. The forest contains
two domains named contoso.com and child.contoso.com. All domain controllers run
Windows Server 2008. All forest-wide operations master roles are in child.contoso.com.
An administrator successfully runs adprep.exe /forestprep from the Windows Server 2008
R2 Service Pack 1 (SP1) installation media.

You plan to run adprep.exe /domainprep in each domain.
You need to ensure that you have the required user rights to run the command successfully
in each domain.
Of which groups should you be a member? (Each correct answer presents part of the
solution.
Choose two.)

A.
Administrators in child.contoso.com

B.
Enterprise Admins in contoso.com

C.
Domain Admins in child.contoso.com

D.
Domain Admins in contoso.com

E.
Administrators in contoso.com

F.
Schema Admins in contoso.com

Explanation:
http://technet.microsoft.com/de-de/library/cc731728.aspx
Adprep /domainprep
Prepares a domain for the introduction of a domain controller that runs Windows Server
2008. You run this command after the forestprep command finishes and after the changes
replicate to all the domain controllers in the forest.
Run this command in each domain where you plan to add a domain controller that runs
Windows Server 2008.
You must run this command on the domain controller that holds the infrastructure operations
master role for the domain. You must be a member of the Domain Admins group to run this
command.