You are managing an ASM instance. You previously issued the following statements: ALTER DISKGROUP dg1 DROP DISK disk2; ALTER DISKGROUP dg1 DROP DISK disk3; ALTER DISKGROUP dg1 DROP DISK disk5; You want to cancel the disk drops that are pending for the DG1 disk group. Which statement should you issue?（）

A、ALTER DISKGROUP dg1 UNDROP disk2, disk3, disk5;

B、ALTER DISKGROUP dg1 UNDROP;

C、ALTER DISKGROUP dg1 UNDROP DISKS;

D、You cannot cancel the pending disk drops.

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