（655）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

答案：（A）

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Oracle 11G OCP 1Z0-053 655