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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.

　　If the DROP DISK operation has not yet completed,you can cancel and roll back the entire DROP DISK operation by using ALTER DISKGROUP_UNDROP DISKS,with the disk group still being continuously available to all users.
　　在没有完全 drop 前，可以使用 undrop 取消 drop
Undropping a Disk from a Disk Group: Example To cancel the drop of disks from a diskgroup, dgroup_01, issue the following statement:
　　ALTER DISKGROUP dgroup_01UNDROP DISKS;
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