How can you reverse the effects of an ALTER DISKGROUP ... DROP DISK command if it has alreadycompleted?（）

AIssue the ALTER DISKGROUP ... ADD DISK command.

BIssue the ALTER DISKGROUP ... UNDROP DISKS command.

CIssue the ALTER DISKGROUP ... DROP DISK CANCEL command.

DRetrieve the disk from the Recycle Bin after the operation completes