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 start the DHCP service, but it does not start. You need to ensure that the DHCP service starts. What should you do?（）
- ARestart DHCP1.
- BConfigure a scope on DHCP1.
- CActivate the scope on DHCP1.
- DAuthorize DHCP1 in the active directory domain.