In a process costing operation, the direct labor of a production department includes: A.All labor used exclusively by that department, but only if the labor is applied to the product itself. B.Only labor that helps more than one production department, such as clerical, repair, and computer technicians. C.All labor for that department, including labor for services that help more than one production department, such as clerical, repair, and computer technicians. D.Only that labor that is recorded in the Factory Payroll account. E.All labor used exclusively by that department, even if the labor is not applied to the product itself