单选题

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

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 co pleted

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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