Which task must the network engineer perform when implementing this new architecture?

The network-engineering team of a service provider is integrating several recently acquired networks into a more scalable common Unified MPLS architecture.

The new network architecture will support end-to-end VPNv4 and VPNv6 services with these requirements:

• The IGP of the core layer is IS-IS In Area 0.

• The IGP of the aggregation layers is OSPF in Area 0.

• The LDP protocol Is used to distribute label bindings within each IGP domain.

Which task must the network engineer perform when implementing this new architecture?
A . Configure BGP-LU between ABR routers of each IGP domain to carry MPLS label information in NLR
C . Configure a BGP session between the ABR routers of each IGP domain to exchange VPNv4 or VPNv6 prefixes
D . Configure the ABR in each IGP domain to preserve next-hop information on all VPNv4 and VPNv6 prefixes advertised by the P
F . Configure mutual redistribution of each IGP domain’s loopback prefix to provide end-to-end LDP LSP

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Answer: D