What are two MPLS label characteristics? (Choose two)

What are two MPLS label characteristics? (Choose two)
A . A maximum of two labels can be imposed on an MPLS packet.
B . The label edge router swaps labels on the received packets.
C . LDP uses TCP for reliable delivery of information.
D . An MPLS label is a short identifier that identifies a forwarding equivalence class.
E . Labels are imposed in packets after the Layer 3 header.

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Answer: C D