Assume users are regularly moving throughout the enterprise. Which scenario is a good candidate for Extension Mobility?

A.
Multiple campuses, each as its own cluster

B.
Single campus, one cluster per building

C.
Multiple campuses, each connecting into a single cluster

D.
Single building, one cluster for each floor

Explanation:
Reference:
http://www.cisco.com/en/US/partner/products/sw/voicesw/ps556/products_administration_guide_chapter09186 a