If you use ALTER DISKGROUP ... ADD DISK and specify a wildcard for the discovery string， what happens to disks that are already a part of the same or another disk group？（）  

• A、 The command fails unless you specify the FORCE option.
• B、 The command fails unless you specify the REUSE option.
• C、 The command must be reissued with a more specific discovery string.
• D、 The other disks， already part of the disk group，are ignored.