单选题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?（）AWhen two-way disk mirroring is required for the allocation unitsBWhen three-way disk mirroring is required for the allocation unitsCWhen using hardware mirroring or RAIDDWhen disk mirroring is required for the Automatic Storage Management (ASM) disks
单选题
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) disks
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