When the BGP additional-paths feature is used what allows a BGP speaker to differentiate between the different available paths?

When the BGP additional-paths feature is used what allows a BGP speaker to differentiate between the different available paths?
A . A router distinguisher is appended to the prefix by the receiving BGP speaker.
B . The additional path information is encoded in an extended community
C . The remote BGP peer prepends its own next-hop address to the prefix.
D . A unique path identifier is encoded into a dedicated field to the NLR

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Answer: D