Which three steps must be completed in order to assign a service URL to an IP phone button? (Choose three.)
A.
Assign the IP phone service partition to the CSS of the phone.
B.
Subscribe the phone to the service.
C.
Create a softkey template that includes a service URL and assign it to the phone.
D.
Create a phone button template that includes a service URL and assign it to the phone.
E.
Add an IP phone service.
F.
Associate a valid user profile with the phone.