Your company has a Windows Server 2003 environment with a single Active Directory directory service forest. The forest has multiple domains and two sites named Site1 and Site2. Site1 has six domain controllers. Two of the domain controllers are global catalog servers. Site2 has three domain controllers. The WAN link between Site1 and Site2 is slow. You are preparing the environment for an Active Directory application that requires universal group membership to make authorization decisions. Application servers will be located in Site1 and Site2. You need to prepare the Active Directory environment for the introduction of the Active Directory application. What should you do?

A.
Increase the number of domain controllers in Site2 to four.

B.
Enable universal group membership caching in Site1.

C.
Add additional global catalog servers to Site1.

D.
Configure at least one of the domain controllers in Site2 to be a global catalog server.