What is a function of the metadata service in an object-based storage device (OSD)?

What is a function of the metadata service in an object-based storage device (OSD)?
A . Generates the file system namespace from the file contents.
B . Manages both physical and logical disks on which the user data is stored.
C . Manages the storage space for all remote clients.
D . Maintains the object IDs and file system namespace mappings.

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Answer: D