Which of the following statements is incorrect about BGP/MPLS IP VPN data forwarding?

Which of the following statements is incorrect about BGP/MPLS IP VPN data forwarding?
A . A data packet always carries two labels when being transmitted on a BGP/MPLS IP VPN backbone network.
B. The outer label used to guide data forwarding can be distributed by LDP.
C. The inner label used to guide data forwarding is distributed by MP- BGP.
D. Packets sent by a PE to a CE are IPv4 packets.

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Answer: B