You are the network administrator for Adventure Works. The network consists of a single Active Directory forest that contains a forest root domain named adventure/x7fworks.com and a child domain named child1.adventure/x7fworks.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.adventure/x7fworks.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.