Which of the following statements regarding well-known discretionary attributes are true? (Multiple Choice)

Which of the following statements regarding well-known discretionary attributes are true? (Multiple Choice)
A . All BGP routers must identify these attributes.
B . These attributes must be transmitted between BGP peers.
C . These attributes do not necessary to be carried in Update messages, and BGP routers can determine whether to carry them in Update messages.
D . These attributes do not necessary to be transmitted between BGP peers.

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Answer: ACD