單項選擇題Which of the following answers is most true about the BGP Update message?()

A. It lists a set of path attributes, along with a list of prefixes that use those PAs
B. It lists a prefix/length, plus the PA settings for that prefix
C. It  lists withdrawn routes, but never in the same Update message as newly advertised routes
D. A single Update message lists at most a single prefix/lengtH


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