You are the network administrator for Adventure Works. The network consists of a single Active Directory forest that contains a forest root domain named adventure­works.com and a child domain named child1.adventure­works.com. The functional level of the forest is Windows Server 2003.The company uses universal groups to prevent temporary employees from accessing confidential information on computers in the forest. The child1.adventure­works.com domain contains a Windows 2000 Server computer named Server1. Server1 runs an application that makes frequent LDAP queries to the global catalog. Server1 is located on a subnet associated with an Active Directory site named Site2 that has no global catalog servers. Site2 is connected to another site by a WAN connection. You need to enable the application on Server1 to run at high performance levels and to continue operating if a WAN connection fails. You also need to minimize traffic over the WAN connection. 
What should you do？（）

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.