Which statements regarding BGP well-known mandatory attributes are true? (Select 3 answers)

Which statements regarding BGP well-known mandatory attributes are true? (Select 3 answers)

A. Well-known mandatory attributes must be recognized by all BGP routers. B. Well-known mandatory attributes impacts the path decision process. C. Well-known mandatory attributes are optional in an Update packet, and can be included in an Update packet as needed. D. Well-known mandatory attributes must be included in all Update packets.