A customer needs the following mobile features for each of its users:

a single business number for both desktop and mobile phones a single mailbox for both devices
voice call continuity from desktop to mobile and vice versa

Which product would provide the best solution?

A.
Cisco Unified Mobility on Unified Communications Manager

B.
Cisco Unified Mobile Communicator

C.
Nokia E-Series dual mode phones

D.
Cisco Unified Wireless IP Phones 7920 or 7921