Which two statements are true about the RPF check? (Choose two.)

Which two statements are true about the RPF check? (Choose two.)

A. The RPF check is run on the first sent packet of any new session. B. The RPF check is run on the first reply packet of any new session. C. The RPF check is run on the first sent and reply packet of any new session. D. RPF is a mechanism that protects FortiGate and your network from IP spoofing attacks.