Certkiller .com has a domain controller that runs Windows Server 2008. The Certkiller .com network boosts 40 Windows Vista client machines. As an administrator at Certkiller .com， you want to deploy Active Directory Certificate service （AD CS） to authorize the network users by issuing digital certificates. 
What should you do to manage certificate settings on all machines in a domain from one main location（）

A.Move the RID master role in the child domain to a domain controller that holds the Global Catalog.
B.Modify the schema to enable replication of the friendlynames attribute to the Global Catalog.
C.Move the RID master role in the child domain to a domain controller that does not hold the Global Catalog.
D.Move the infrastructure master role in the child domain to a domain controller that does not hold the Global Catalog.

A.Use the Active Directory Sites and Services console to configure a new site link bridge object.
B.Use the Active Directory Sites and Services console to decrease the site link cost between Site1 and Site2.
C.Use the Active Directory Sites and Services console to assign a new IP subnet to Site2. Move the new domain controller object to Site2.
D.Use the Active Directory Sites and Services console to configure the new domain controller as a preferred bridgehead server for Site1.

A.Register the Schmmgmt.dll. Start the Active Directory Schema snap-in.
B.Configure DC2 as a bridgehead server
C.On DC2， seize the Schema Master role
D.Log off and log on again to Active Directory by using an account that is a member of the Schema Administrators group. Start the Actrve Directory Schema snap-in.