Cost Graph Three Cost Graph Four 0 Total Units Produced 0 Total Units Produced For each of the following costs, identify the cost graph that best illustrates its cost behavior as the number of units produced increases: a. Total direct materials cost Cost Graph Three b. Electricity costs of $1,000 per month plus $0.10 per kilowatt-hour Cost Graph Four X c. Per-unit cost of straight-line depreciation on factory equipment Cost Graph One X d. Salary of quality control supervisor, $20,000 per month Cost Graph Two e. Per-unit direct labor cost Cost Graph Two X