Which descriptions are correct about the Next Hop attribute of BGP? (Multiple Choice)

Which descriptions are correct about the Next Hop attribute of BGP? (Multiple Choice)
A . Must exist in the Update message
B . Not necessarily the IP address of the neighbor device
C . There may be no Next_Hop attribute in the Update message.
D . The BGP speaker does not change the next hop attribute of the routing information when it advertises a route to the EBGP peer.

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Answer: AB