What does the disk status Degraded mean for RAID management?

What does the disk status Degraded mean for RAID management?
A . One or more drives are missing from the FortiAnalyzer unit. The drive is no longer available to the operating system.
B. The FortiAnalyzer device is writing to all the hard drives on the device in order to make the array fault tolerant.
C. The FortiAnalyzer device is writing data to a newly added hard drive in order to restore the hard drive to an optimal state.
D. The hard driveiIs no longer being used by the RAID controller

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Answer: D