Which message will be identified as incorrect during negotiation in the Error Code of the Notification message?

When two BGP peers establish a TCP connection normal but their AS numbers and BGP versions are inconsistent, a BGP peer often sends a Notification message to disconnect the TCP connection after they establish a TCP connection and exchange some information.

Which message will be identified as incorrect during negotiation in the Error Code of the Notification message?
A . Route-refresh
B . Open
C . Keepalive
D . Update

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Answer: B