Service providers that implement MPLS Inter-AS Option B must ensure that the ASBRs between each provider learn all VPNv4 routes from both providers.
How can this requirement be accomplished?
A. Configure the VRFs from the connection provider in order to learn route targets on each ASBR.
B. Ensure that LDP is configured between each ASBR for label exchange on all VRFs.
C. Ensure that each ASBR is configured for all VRFs from within its own provider backbone
D. Configure each ASBR to retain route targets for all VPNv4-learned routes
