When starting up your ASM instance, you receive the following error: What is the cause of the error?（）

• A、The ASM_DISKGROUPS parameter is configured for three disk groups: DGROUP1, DGROUP2, and DGROUP3. The underlying disks for these disk groups have apparently been lost.
• B、The format of the ASM_DISKGROUPS parameter is incorrect. It should reference the disk group numbers, not the names of the disk groups
• C、The ASM_POWER_LIMIT parameter is incorrectly set to 1. It should be set to the number of disk groups being attached to the ASM instance.
• D、The ASM_DISKSTRING parameter is not set; therefore disk discovery is not possible. 
• E、There is insufficient information to solve this problem.