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
出自:Oracle认证