What is an accurate statement about three-way NDMP backup in a NAS environment?

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What is an accurate statement about three-way NDMP backup in a NAS environment?
A . Backup device can be shared among multiple NAS heads
B . Each NAS head should have a dedicated backup device
C . Backup data traverses at least three NAS heads before reaching the backup device
D . Backup is performed only when three or more NAS heads are present

Answer: A