What is the relationship between a Forwarding Equivalence Class (FEC) and the MPLS label that a Label Switching Router (LSR) advertises for that FEC?
A. An LSR assigns the same label to FECs with the same best next hop: labels remain constant across the MPLS domain
B. The LSR assigns a unique label to each FEC, but labels assigned by different LSRs do not necessarily match.
C. The LSR assigns a unique label to each FEC. and that label remains constant across the MPLS domain
D. An LSR assigns the same label to FECs with the same best next hop; labels assigned by different LSRs do not necessarily match
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