Your RAID 5 array on a Smart Array sustains a drive failure. A host spare replaces the failed drive
and rebuilds successfully. After replacing the failed drive with a new drive, what happens next?

A.
The spare drive replicates its data to the new drive and both work as a mirror until you evict the
spare drive.

B.
The new drive stays offline until you assign it to the array, at which point it automatically takes
the place of the spare drive.

C.
The new drive re-assumes its place in the RAID set and after data rebuild is complete, the drive
that was the spare once again becomes a hot spare drive.

D.
The new drive becomes a spare drive and you must go to the ACU to remove the old spare
drive and then re-add the new drive to the array.

Explanation:
Industry Standard Architecture – Student Guide 1 – Page 269:
Online spare drives
As soon as the failed drive is replaced, data is automatically rebuilt on the new drive. After data
has been completely rebuilt on the new drive, the online spare returns to its role as an online
spare drive. This avoids roaming online spare drives.