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.