Which three steps must be completed in order to assign a service URL to an IP Phone button?

A.	Add an IP phone service.
B.	Assign the IP phone service partition to the CSS of the phone.
C.	Create a phone button template that includes a service URL and assign it to the phone.
D.	Create a softkey template that includes a service URL and assign it to the phone.
E.	Subscribe the phone to the service.
F.	Associate a valid user profile with the phone.