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…

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?