（153）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.

答案：（C）