Go back to 4A0-102 - Alcatel-Lucent Border Gateway Protocol

Question :-

Which of the following regarding BGP Path Identifier is FALSE?
Path-ID is a four-octet identifier pre-pended to the NLRI field of a BGP update.
Path-ID is an optional transitive attribute used to advertise multiple paths.
Path-ID uniquely identifies each path advertised to a neighbor.
A BGP speaker that re-advertises a route must generate its own Path-ID.

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