Which of the following causes for VRRP group flapping is the most impossible?

Which of the following causes for VRRP group flapping is the most impossible?
A . The link where VRRP Advertisement packets are transmitted changes from Up to Down frequently,
B . The interval for sending VRRP Advertisement packets is small.
C . Association between VRRP and BFD is configured to implement a rapid master/backup switchover.
D . VRRP packets are discarded randomly because congestion occurs.

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Answer: C