Which Inter-AS option allows a service provider to provision AToM along with L3VPN provisioning?
A. MPLS VPN Inter-AS with ASBRs exchanging VPN-IPv4 addresses
B. MPLS VPN Inter-AS with ASBRs exchanging IPv4 routes and MPLS labels
C. MPLS VPN Inter-AS Option AB
D. back-to-back VRFs