Which two initialization parameters must be set to start up an ASM instance in a RAC environment?

Which two initialization parameters must be set to start up an ASM instance in a RAC environment?

(Choose two.)

A.
INSTANCE_TYPE

B.
DB_UNIQUE_NAME

C.
ASM_DISKSTRING

D.
ASM_DISKGROUPS

E.
ASM_POWER_LIMIT

F.
CLUSTER_DATABASE