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

• 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