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

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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.

Answer: D