What is the role of a segment routing mapping server?

What is the role of a segment routing mapping server?
A . It advertises a local SID mapping policy to all of 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