Which of the following metrics is MOST valuable to the administrator in determining how many hard drives to keep-on hand?

Following a recent outage, a systems administrator is conducting a study to determine a suitable bench stock on server hard drives.

Which of the following metrics is MOST valuable to the administrator in determining how many hard drives to keep-on hand?
A . TTR
B . ALE
C . MTBF
D . SLE
E . RPO

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Answer: C