问题：
What is constant bit rate (CBR) in MPEG-2?
答案：
a) An operation where the bit rate is constant from start to finish of the compressed bit stream.
b) A variety of MPEG video compression where the amount of compression does not change.
c) Traffic that requires guaranteed levels of service and throughput in delay-sensitive applications such as audio and video that are digitized and represented by a continuous bit stream.
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