A. It supports the full range of collaboration services on Cisco and third-party devices.

B. It supports the full range of collaboration services only on Cisco devices

C. It replaces the analog technology of PBX with a centralized IP-based communications infrastructure.

D. It is used only to support voice routing and calling

E. It combines the analog technology of PBX with a centralized IP-based communications infrastructure.

F. It is at the center of the Cisco collaboration architecture.