Coco Co. will manufacture 2,000 cases of product M next week. The accountant provided the following analysis of total manufacturing cost Cost driver Direct labor hours used machine hours used Constant 1000 500 Variable coefficient 200 250 2 0.82 0.67 Which cost driver would be used to determine the cost function for total manufacturing cost? Select one: O a direct labor hours used Ob. variable coefficient 12 O d. machine hours used