Which of the following statements about the BFD single-arm echo function are correct? (Multiple Choice)

Which of the following statements about the BFD single-arm echo function are correct? (Multiple Choice)
A . The BFD single-arm echo function must be configured with a local identifier and a remote identifier.
B . The default destination IP address of the BFD single-arm echo function protocol packet is 224.0.0.184.
C . BFD single-arm echo function is applicable to scenarios where one device supports BFD and the other device does not.
D . After the BFD single-arm echo function is enabled, the destination IP and source IP of the BFD packets are the same.

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Answer: CD