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C、C. It lists withdrawn routes, but never in the same Update message as newly advertised routes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