What would protect you from a third disk failure while you are still reconstructing the two failed disks?

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You have created an aggregate with one RAID group on your ONTAP 9 cluster. Two disks have already failed and have not finished reconstructing.

What would protect you from a third disk failure while you are still reconstructing the two failed disks?
A . RAID-TEC
B . RAID-4
C . RAID-0
D . RAID-DP

Answer: B