Which two statements are true regarding an Automatic Storage Management （ASM） instance？（）

A、 As ASM instance mounts an ASM control file

B、 An ASM instance uses the ASMB process for rebalancing of disks within a disk group

C、 Automatic Memory Management is enabled in an ASM instance even when the MEMORY_TARGET  parameter is not set explicitly

D、 An RDBMS instance gets connected to an ASM instance using ASMB as a foreground process when the database instance is started