Examine the following ALTER command:<br /> SQL> ALTER DISKGROUP dgroup1 UNDROP DISKS;<br /> 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 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