When unicast reverse path forwarding is configured on an interface, which action does the interface take first when it receives a packet?

When unicast reverse path forwarding is configured on an interface, which action does the interface take first when it receives a packet?
A . it verifies that the source has a valid VEF adjacency.
B . It checks the egress access lists.
C . it verifies a reverse path via the FIB to the source.
D . It checks the ingress access lists.

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Answer: C