You Have Multiple MPLS LSP Domains That You Want to Internetwork

Multiple Choice

You have multiple MPLS LSP domains that you want to internetwork. Your provider's backbone is IP. How to internetwork without disrupting the outlying MPLS domains or the provider?

A) have MP-BGP exchange labeled routes between the MPLS domains and the provider
B) have MPLS LSPs utilize GRE tunnels
C) use MPLS Traffic Engineering across the multiple MPLS domains and the core
D) have each PE receive IP packets, add an MPLS header, and forward them to the next PE in the LSP