Which parameter is mandatory?

In an ASM instance, there are several parameters that have meanings specific to the ASM. Which
parameter is mandatory?

A.
ASM_DISKGROUP

B.
ASM_DISKSTRING

C.
INSTANCE_TYPE

D.
CLUSTER_DATABASE

E.
MEMORY_TARGET

F.
ASM_POWER_LIMIT

Explanation:
Oracle ASM Parameter Setting Recommendations
This section contains information about the following parameters for Oracle ASM:
Oracle Automatic Storage Management Administrator’s Guide