Which Statements About BGP Well-Known Mandatory Attributes Are True? (Choose

Which statements about BGP well-known mandatory attributes are true? (Choose three.)

A) Well-known mandatory attributes must be identified by all BGP routers.
B) Well-known mandatory attributes must be transmitted between BGP peers.
C) Well-known mandatory attributes are optional in an Update packet, and can be carried in an Update packet as needed.
D) Well-known mandatory attributes must be carried in an Update packet.