What is the role of segment routing mapping server?

What is the role of segment routing mapping server?
A . It advertises a local SID mapping policy to all the mapping clients.
B. It works with IGP instances to calculate the prefix-SIDs in the absence of a mapping policy.
C. It selects multiple mapping entries to create overlapping active mapping policies.
D. It reads and translates remotely received SIDs from other mapping servers to create SID mapping entries.

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Answer: A