Which of the following is the MOST likely reason for this issue?

A high-end workstation is operating as expected, but two of the four SATA drives are displaying solid fault lights.
Which of the following is the MOST likely reason for this issue?
A. RAID 5 is being used.
B. The RAID level of the disk array is 10.
C. An M.2 boot device is being used.
D. The RAID controller cache is turned on.

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