Which statement is true regarding default MPLS label handling?
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A.
A router that pops a label from a label stack always pushes a new label on the packet
B.
A router that pops a label from a label stack forwards a frame based on the label that was popped.
C.
A router that pops a label from a label stack forwards a frame based on the underlying destination IP
address.
D.
A router that pops a label from a label stack applies class of service based on the IP header to ToS bits.