Which initialization parameter in an ASM instance specifies the disk groups to be automatically mounted at instance startup?

Which initialization parameter in an ASM instance specifies the disk groups to be
automatically mounted at instance startup?

A.
ASM_DISKMOUNT

B.
ASM_DISKGROUP

C.
ASM_DISKSTRING

D.
ASM_MOUNTGROUP

Explanation:
Refer to here
When you run the STARTUP command, this command attempts to mount the disk groups
specified by the initialization parameter ASM_DISKGROUPS. If you have not entered a
value for ASM_DISKGROUPS, then the ASM instance starts and Oracle displays an errorthat no disk groups were mounted. You can then mount disk groups with the ALTER
DISKGROUP…MOUNT command.