Extension Mobility (EM) is a Cisco Unified Communications Manager (CUCM) feature that separates user configuration from physical phone hardware, enabling hot-desking in contact center environments.
Why the Correct Answer is Right: C precisely matches the official Cisco definition-EM allows agents to log into any IP phone and have their personal phone configuration (line appearances, services, speed dials) follow them. This is critical in hot-desking CCE environments as documented in the Cisco CUCM Administration Guide.
Why Each Incorrect Answer is Wrong: A is wrong because Device profiles for Extension Mobility are created and managed in CUCM, not in CCE. B is wrong because adding device profiles and phones to the PG user account describes a PG configuration step, not the definition of Extension Mobility. D is wrong because Extension Mobility Cross Cluster (EMCC) specifically enables EM across different CUCM clusters-this statement is the opposite of correct.
################################################################################