Which of the following regarding "well-known discretionary” BGP attributes is TRUE?

Which of the following regarding "well-known discretionary” BGP attributes is TRUE?
A . They must be recognized by all peers and included in all BGP updates.
B . They are discarded if not recognized by the recipient.
C . They must be recognized by all peers and optionally included in BGP updates.
D . The receiving router sends a notification if a well-known discretionary attribute is not present in an update.

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Answer: C