What is the result of a successful RPF check?

What is the result of a successful RPF check?
A . Packet is dropped because it arrived on the interface that used to forward the packet back to source.
B . Packet is dropped because it arrived on the interface that used to forward the packet back to destination.
C . Packet is forwarded because it arrived on the interface that used to forward the packet back to destination
D . Packet is forwarded because it arrived on the interface that used to forward the packet back to source

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Answer: D