Examine the following ALTER command: SQL> ALTER DISKGROUP dgroup1 UNDROP DISKS; What is the purpose of the command?（）

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  A . It cancels all pending disk drops within the disk group B . It restores disks that are being dropped as the result of a DROP DISKGROUP operation C . It mounts disks in the disk group for which the drop-disk operation has already been completed D . It restores all the dropped disks in the disk group for which the drop-disk operation has already been completed E . It adds previously dropped disks back into the disk grou

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  A. It cancels all pending disk drops within the disk group B. It restores disks that are being dropped as the result of a DROP DISKGROUP operation C. It mounts disks in the disk group for which the drop-disk operation has already been completed D. It restores all the dropped disks in the disk group for which the drop-disk operation has already been completed E. It adds previously dropped disks back into the disk group

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