Which is the reason that the video terminal manufacturer, models, and versions are important parts o

Which is the reason that the video terminal manufacturer, models, and versions are important parts of the planning process?

A.
Only a few devices can support SIP and video.

B.
All video terminals can dial in to Cisco Unified MeetingPlace video meetings.

C.
Cisco Unified MeetingPlace is a SIP-based solution and H.320 devices cannot be supported.

D.
Some versions of H.323, SIP, and H.320 video devices cannot negotiate the mid-call escalation correctly.