Your network contains an Active Directory forest. The forest contains two domains named fabrikam.com and eu.fabrikam.com. The functional level of the fabrikam.com domain is Windows Server 2003 interim. The functional level of the eu.fabrikam.com domain is Windows Server 2003. The fabrikam.com domain contains a domain controller named DC1. DC1 runs Windows Server 2003 Service Pack 2 (SP2). DC1 is configured as a global catalog server. The eu.fabrikam.com domain contains a domain controller named DC2. DC2 runs Windows Server 2003 RTM. You need to recommend changes to the Active Directory forest to ensure that servers that run Exchange Server 2010 Service Pack 1 (SP1) can be deployed to both domains.
What should you do?
A.
Upgrade the operating system on DC1 and DC2. Raise the functional level of the fabrikam.com domain.
B.
Upgrade the operating system on DC1 and DC2. Enable universal group membership caching in each site.
C.
Upgrade the operating system on DC2. Raise the functional level of the fabrikam.com domain.
Raise the functional level of the forest.
D.
Raise the functional level of the fabrikam.com domain and the eu.fabrikam.com domain. Enable universal group membership caching in all sites.