Which of the following about inter-AS model B VPRN is TRUE?

Which of the following about inter-AS model B VPRN is TRUE?
A . The ASBRs use MP-eBGP to peer with each other and exchange IPv4 routes between autonomous systems.
B. The ASBRs use MP-iBGP to peer with PE routers in their autonomous system and exchange VPN-IPv4 routes.
C. The ASBRs maintain a mapping of labels for IPv4 routes exchanged between autonomous systems.
D. The ASBRs require per-VPRN configuration.

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Answer: B