When learning accept mode is set to auto, and the action is set to rotate, when is the KB created and used?

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When learning accept mode is set to auto, and the action is set to rotate, when is the KB created and used?
A . It is created every 24 hours and used for 24 hours.
B . It is created every 24 hours, but the current KB is used.
C . It is created every 1 hour and used for 24 hours.
D . A KB is created only in manual mode.

Answer: A