What is the best practice when adding disks to a disk group with 12 disks in an EVA 2C6D?

A.
Add disks in multiples of six; distributed evenly across the shelves.

B.
Add disks in multiples of 14; distributed evenly across the shelves.

C.
Add disks in multiples of eight; distributed evenly across the shelves.

D.
Add disks in multiples of 10; distributed evenly across the shelves.