Which three steps are necessary in order to configure DHCP for phone support using the GUI in Cisco Unified Communications Manager 6.0? (Choose three.)

A.
download the DHCP server application from the plug-in page

B.
activate DHCP Monitor Service

C.
configure the DHCP subnet

D.
add and configure the DHCP server

E.
start the application on an external server

F.
add the DHCP server IP address to the device pool