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?（）

A. Restart DHCP1.
B. Configure a scope on DHCP1.
C. Activate the scope on DHCP1.
D. Authorize DHCP1 in the active directory domain.