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
题目
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