How many of the new disks are used for data?

Click the Exhibit button.

The maximum RAID group size of the RAID-DP aggr1 shown in the exhibit is 18. You expand the aggregate by
20 disks.
How many of the new disks are used for data?

A.
20

B.
16

C.
14

D.
18

Explanation:
RAID 6 extends RAID 5 by adding another parity block; thus, it uses block-level striping with two parity blocks
distributed across all member disks.
Figure: Diagram of a RAID 6 setup, which is identical to RAID 5 other than the addition of a second parity block

Incorrect Answers:D: RAID0 does not use parity,
https://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_6