How does a router in an MPLS environment handle a packet whose label stack has a depth of 0?

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answerhappygod
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How does a router in an MPLS environment handle a packet whose label stack has a depth of 0?

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How does a router in an MPLS environment handle a packet whose label stack has a depth of 0?

A. It discards the packet
B. It uses IP routing to forward the packet
C. It queues the packet for later transmission
D. It applies a label of 0 to the packet and forwards it out all Layer 3 interfaces
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