You are a network administrator for your company. The network consists of a single Active Directory forest that contains one root domain and multiple child domains. The functional level of all child domains is Windows Server 2003. The functional level of the root domain is Windows 2000 native.You configure a Windows Server 2003 computer named Server1 to be a domain controller for an existing child domain. Server1 is located at a new branch office, and you connect Server1 to a central data center by a persistent VPN connection over a DSL line. Server1 has a single replication connection with a bridgehead domain controller in the central data center.You configure DNS on Server1 and create secondary forward lookup zones for each domain in the forest.You need to minimize the amount of traffic over the VPN connection caused by logon activities.What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A.
Configure the DNS zones to be Active Directory-integrated zones.

B.
Configure Server1 to be the PDC emulator for the domain.

C.
Configure Server1 to be a global catalog server.

D.
Configure universal group membership caching on Server1.