Your network contains an Active Directory forest. The forest contains two domains named
contoso.com and corp.contoso.com. All domain controllers run Windows Server 2012 R2
and are configured as global catalog servers.
The corp.contoso.com domain contains a domain controller named DC1.
You need to disable the global catalog on DC1.
What should you do?

A.
From Active Directory Users and Computers, modify the properties of the DC1 computer
account.

B.
From Active Directory Administrative Center, modify the properties of the DC1 computer
account.

C.
From Active Directory Domains and Trusts, modify the properties of the corp.contoso.com
domain.

D.
From Active Directory Sites and Services, modify the NTDS Settings of the DC1 server
object.

Explanation:
When you navigate your way to the Active Directory Sites and
Services\Sites\SiteName\Servers then in the details pane, right-click NTDS Settings of the
selected server object, and then click Properties. There will you get access to the Global
Catalog check box to add the global catalog, or clear the check box to remove the global
catalog.
Incorrect answers:
A: The Active Directory Users and Computers console does not allow you to remove the
global catalogue.
B: The Active Directory Administrative Center does not give to access to the NTDS settings
that you need to access to remove the global catalogue.
D: He Active Directory Domains and Trust console will not give you access to the NTDS
settings that you need to disable the global catalogue.
References:
http://technet.microsoft.com/en-us/library/cc755257.aspx