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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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出自：Oracle认证

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