There are six RAID levels in the RAID structure as shown follows.

Please explain the major features of each RAID level.

$($a$)$ RAID $0$: non$-$redundant striping.

$($b$)$ RAID $1$: mirrored disks.

$($c$)$ RAID $2$: memory$-$style error$-$correcting codes.

$($d$)$ RAID $3$: bit$-$interleaved parity.

$($e$)$ RAID $4$: block$-$interleaved parity.

$($f$)$ RAID $5$: block$-$interleaved distributed parity.

$($g$)$ RAID $6$: $P+Q$ redundancy.