According to NetApp, which two scenarios are recommended for a RAID-DP aggregate in
clustered Data ONTAP 8.3? (Choose two.)

A.
three or more disks if it is a data aggregate

B.
three or more disks if it is a root aggregate

C.
two or more disks if it is a root aggregate

D.
five or more disks if it is a data aggregate

Explanation:

The minimum number of disks in a RAID-DP group is three: at least one data disk,
one regular parity disk, and one double-parity (dParity) disk. However, for non-root aggregates
with only one RAID group, you must have at least 5 disks (three data disks and two parity disks). Clustered Data ONTAP 8.3, Physical Storage Management Guide, page 108
https://library.netapp.com/ecm/ecm_download_file/ECMP1636022