What is a characteristic of video traffic that governs QoS requirements for video?

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What is a characteristic of video traffic that governs QoS requirements for video?
A . Video is typically constant bit rate.
B . Voice and video are the same, so they have the same QoS requirements.
C . Voice and video traffic are different, but they have the same QoS requirements.
D . Video is typically variable bit rate.

Answer: D