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
题目
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