When the Services Key Is Pressed Cisco Extension Mobility Does

Multiple Choice

When the services key is pressed Cisco Extension Mobility does not show up. What is the cause of the issue?

A) The URL configured for Cisco Extension Mobility is not correct.
B) Cisco Extension Mobility Service is not running.
C) The phone is not subscribed to Cisco Extension Mobility Service.
D) Cisco Extension Mobility is not enabled in the Phone Configuration Window (Device > Phone)