An administrator has configured a strict RPF check on FortiGate. Which statement is true about the strict RPF check?

An administrator has configured a strict RPF check on FortiGate.
Which statement is true about the strict RPF check?

A. The strict RPF check is run on the first sent and reply packet of any new session. B. Strict RPF checks the best route back to the source using the incoming interface. C. Strict RPF checks only for the existence of at least one active route back to the source using the incoming interface. D. Strict RPF allows packets back to sources with all active routes.