When using MPLS unicast IP forwarding, what will happen if an LSR receives an incoming labeled packet but the LSR can’t find that incoming label in its LFIB?

A.
The packet will be forwarded using the FIB.

B.
The packet will be forwarded using the LIB.

C.
The packet will be process switched by performing a route lookup in the routing table.

D.
The packet will be forwarded using the LFIB with an imp-null outgoing label.

E.
The packet will be dropped even if the IP destination exists in the FIB.