Examine the CREATE DISKGROUP command used to create a disk group： SQL> CREATE DISKGROUP misc EXTERNAL REDUNDANCY DISK ’ORCL： FRA3’ NAME misc1， ’ORCL： FRA4’ NAME misc2； In which situation would you use this method of disk group creation？（）
- A When two-way disk mirroring is required for the allocation units
- B When three-way disk mirroring is required for the allocation units
- C When using hardware mirroring or RAID
- D When disk mirroring is required for the Automatic Storage Management （ASM） disk