Which are the two purposes of the MPLS label value 1? (Choose two.)

Which are the two purposes of the MPLS label value 1? (Choose two.)
A . It indicates an implicit null label
B . It is used to carry the QoS value in the label stack
C . It is used for VPNv6 packets
D . It is used for MPLS OAM packets
E . It indicates an explicit null label
F . It indicates a router alert label

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Answer: D, F