Your customer using clustered Data ONTAP 8.1.2 recently had a disk drive fail. They already swapped out the failed disk

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Your customer using clustered Data ONTAP 8.1.2 recently had a disk drive fail. They already swapped out the failed disk for a replacement disk. They call you the next day explaining that the disk is not showing up in the spare disk pool.In this scenario, what are two reasons for this problem? (Choose two.)

A. The replacement disk drive needs to be manually un-failed before the disk will show up as a spare.
B. Autoassignis turned off, leaving the disk unassigned; the customer needs to take ownership of the replaced disk before it will show up as a spare disk.
C. The disk ID needs to be removed from the failed disk registry before the disk will be seen as a spare.
D. Autoassign is set to on, but the disk shelves in the loop are shared between a high- availability (HA) pair, causing the disk to show up as unassigned.