Your company has a single Active Directory domain. The domain runs at the functional level of Windows Server 2003. You install the DHCP service on a server named DHCP1. You attempt to startthe DHCP service， but it does not start. You need to ensure that the DHCP service starts. What should you do？（）

• A、Restart DHCP1.
• B、Configure a scope on DHCP1.
• C、Activate the scope on DHCP1.
• D、Authorize DHCP1 in the Active Directory domain.