How can you recover a RAID device after a failure?

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How can you recover a RAID device after a failure?
A . By replacing the failed disk and running the mdadm –rebuild command.
B . By reformatting the RAID device and rebuilding the array from scratch.
C . By running the fsck utility on the array to fix any disk errors.
D . By modifying the /proc/sys/dev/raid/ file to restore the array.

Answer: A