How does an IOS router process a packet that should be switched by Cisco Express Forwarding without an FIB entry?

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How does an IOS router process a packet that should be switched by Cisco Express Forwarding without an FIB entry?
A . by forwarding the packet
B . by dropping the packet
C . by creating a new FIB entry for the packet
D . by looking in the routing table for an alternate FIB entry

Answer: B