ALTER DISKGROUP data MOUNT FORCE;

In which scenario can you use the above command to mount the disk group?

A. when ASM disk goes offline

B. when one or more ASM files are dropped

C. when some disks in a disk group are offline

D. when some disks in a failure group for a disk group are rebalancing

答案：（C）

解析：

《Automatic Storage Management Administrator's Guide》 4.10.1

Oracle ASM对于ALTER DISKGROUP命令提供了MOUNT FORCE选项,在正常或high redundancy模式下，

甚至在磁盘组的有些磁盘不可用的情况下, 来mount ASM磁盘组.

没有MOUNT FORCE选项,如果磁盘组具有损坏或丢失的磁盘,mount磁盘组会失败.