What benefit does a virtual appliance provide while facilitating the movement of files from an old NAS system to a new NAS system?

What benefit does a virtual appliance provide while facilitating the movement of files from an old NAS system to a new NAS system?
A . Facilitates client write operations to the old NAS system and read operations from the new NAS system
B . Balances client workload across old and new NAS systems until all files are moved to the new location
C . Ensures data consistency by taking both old and new NAS systems offline during data migration
D . Eliminates dependencies between data accessed at the file level and locations where files are physically stored

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Answer: D