Regarding the relationship between auxiliary streams and audio and video, which of the following descriptions is wrong?

Regarding the relationship between auxiliary streams and audio and video, which of the following descriptions is wrong?
A . Generally speaking, the codec protocol used by the auxiliary stream is the same as that of ordinary video.
B . Generally speaking, the effect of auxiliary flow is worse than that of mainstream flow
C . Auxiliary streams can also be transmitted on the mainstream channel
D . In a multi-point video conference, the main stream can form a multi-viewer with the auxiliary stream.

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Answer: B