If your answer was RAID-50, you are correct!
RAID-50: This RAID level is RAID-5 with suspenders. Like the other double-digit RAID levels, RAID-50 is a combination of two basic RAID techniques. It combines striping (RAID-0) with independent data disks with distributed parity (RAID-5). It stripes data across at least two RAID-5 arrays.
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