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单项选择题 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

  • C

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