Using MPLS unicast IP forwarding, what will happen if an LSR receives an unlabeled incoming packet?

A.
It will process switch the packet by doing a routing table lookup.

B.
It will forward the packet using the LFIB.

C.
It will forward the packet using the LIB.

D.
It will forward the packet using the FIB.

E.
It will drop the packet immediately.