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As the DBA， you run the following query on your ASM instance. What is the implication of the results of the query？（） SQL> select group_number， name， state from v$ASM_DISKGROUP；  GROUP_NUMBER NAME STATE  0 DGROUP1 DISMOUNTED  2 DGROUP2 MOUNTED  3 DGROUP3 MOUNTED  
A: The DGROUP1 disk group was unmounted by another DBA.
B: A datafile has been lost， causing the ASM disk group DGROUP1 to go into the DISMOUNTED state
C: One of the redundant disks （DGROUP1） has been lost in a disk group.
D: This query has no meaning in an ASM instance.
E: A disk associated with a disk group was discovered after the ASM instance initially opened.

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出自：Oracle认证

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