单项选择题

A. Enable universal group membership caching in Site2. 
B. Configure at least one global catalog server in Site2.
C. Add the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa\IgnoreGCFailures key to the registry on all domain controllers in Site2.
D. Remove Server1 from the child1.adventure­works.com domain and add it to a workgroup.