Refer to the exhibit. Service Provider A has offered to help Service Provider B to provide local connectivity for a customer who has a business operation in North America and recently opened an office in Asia. The service to be offered for the customer is a Layer 3 MPLS VPN. Service Provider A and Service Provider B have never shared any business dealings or interconnected their networks. What is the most secure and easiest way for the two service providers to interconnect?
A. carrier supporting carrier
B. eBGP VPNv4 multihop between route reflectors
C. back-to-back VRF
D. VPNv4 peering between ASBRs
