问题：

[单选]

Your network contains an Active Directory forest. The forest contains two domains named  contoso.com and woodgrovebank.com.  
You have a custom attribute named Attibute1 in Active Directory. Attribute1 is associated to User objects.  
You need to ensure that Attribute1 is replicated to the global catalog.  
What should you do（）

A . In Active Directory Sites and Services， configure the NTDS Settings.
B . In Active Directory Sites and Services， configure the universal group membership caching.
C . From the Active Directory Schema snap-in， modify the properties of the User class schema object.
D . From the Active Directory Schema snap-in， modify the properties of the Attibute1 class schema  attribute.