C. The Version field is not found in a BGP common header. If the common header specifies this to be a BGP OPEN message, then the Version field will be found in the message but not in the BGP common header.
E. There is no WAIT message type. The OPEN message type is used to establish a connection between BGP peers. The NOTIFICATION message type is used to advertise errors. The UPDATE message type is used to advertise topology updates and changes, and the KEEP- ALIVE message type is sent to keep a session active when no UPDATE messages are exchanged during the established hold time.