Which three statements about remotely triggered black hole filtering are true?

Which three statements about remotely triggered black hole filtering are true? (Choose three.)
A. It filters undesirable traffic.
B. It uses BGP or OSPF to trigger a network-wide remotely controlled response to attacks.
C. It provides a rapid-response technique that can be used in handling security-related events and incidents.
D. It requires uRPF.

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