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.