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