What is the maximum number of disks you can add to a single pool?

Refer to the exhibit.

The array has only the disks shown on the exhibit. All disks in the array are 600 GB 15K drives.
One disk is used as a hot spare.

What is the maximum number of disks you can add to a single pool?

A.
25

B.
29

C.
24

D.
16