Which statement about communication over failover interfaces is true?

Which statement about communication over failover interfaces is true?
A . All information that is sent over the failover and stateful failover interfaces is sent as clear text by default.
B . All information that is sent over the failover interface is sent as clear text, but the stateful failover link is encrypted by default.
C . All information that is sent over the failover and stateful failover interfaces is encrypted by default.
D . User names, passwords, and preshared keys are encrypted by default when they are sent over the failover and stateful failover interfaces, but other information is sent as clear text.

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Answer: A