How is routing information distributed on such a network?

A network administrator is planning a new network with a segment-routing architecture using a distributed control plane.

How is routing information distributed on such a network?
A . Each segment is signalled by an SR controller, but each segment makes Its own steering decisions based on SR policy.
B . Each segment is signalled by MPLS, and each segment makes steering decisions based on the routing policy pushed by BG
D . Each segment is signalled by an SR controller that makes the steering decisions for each node.
E . Each segment is signalled by a compatible routing protocol and each segment makes its own steering decisions based on SR policy.

Answer: D