Your network contains an Active Directory domain. All domain controller run Windows Server  2003.     You replace all domain controllers with domain controllers that run Windows Server 2008 R2.     You raise the functional level of the domain to Windows Server 2008 R2.     You need to minimize the amount of SYSVOL replication traffic on the network.     What should you do（）

• A、Raise the functional level of the forest to Windows Server 2008 R2.
• B、Modify the path of the SYSVOL folder on all of the domain controllers.
• C、On a global catalog server， run repadmin.exe and specify the KCC parameter.
• D、On the domain controller that holds the primary domain controller （PDC） emulator FSMO role， run dfsrmig.exe.