When Testing an External LUN with Default Mapping on Two

When testing an external LUN with default mapping on two paths, performance appears constrained and the utilization of the RAID group in the external storage system never exceeds 35% busy no matter how many test threads are generated. You want to increase the utilization of the external RAID group. Which two actions will accomplish this task? (Choose two.)

A) Increase the external path LUN queue depth setting.
B) Increase the number of LUNs mapped from the external RAID group.
C) Change Cache Mode to "Disabled".
D) Increase the server HBA LUN queue depth to 64.