单选题Which of the following answers is most true about the BGP Update message?（）AIt lists a set of path attributes, along with a list of prefixes that use those PAsBIt lists a prefix/length, plus the PA settings for that prefixCIt lists withdrawn routes, but never in the same Update message as newly advertised routesDA single Update message lists at most a single prefix/lengtH
单选题
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It lists withdrawn routes, but never in the same Update message as newly advertised routes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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