Your network consists of a single Active Directory domain. All servers run Windows Server 2003 Service Pack 2 （SP2）. You have a member server named Server1 that is configured as a DHCP server. You install a new stand-alone server named Server2 in the same subnet as Server1. You install the DHCP service on Server2.You need to ensure that Server2 can assign IP configurations to clients on the subnet.  What should you do first？（）

• A、Join Server2 to the domain.
• B、Restart the DCHP Server service on Server1.
• C、From the DHCP snap-in on Server1， add Server2 by using the Add Server option.
• D、From the DHCP snap-in on Server2， add Server 1 by using the Add Server option.