DROP DISK command if it has NOT yet completed?

How can you reverse the effects of an ALTER DISKGROUP … DROP DISK command if it
has NOT yet completed?

A.
Issue the ALTER DISKGROUP … ADD DISK command.

B.
Issue the ALTER DISKGROUP … UNDROP DISKS command.

C.
Issue the ALTER DISKGROUP … DROP DISK CANCEL command.

D.
Retrieve the disk from the Recycle Bin after the operation completes.