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

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.