Advertising Blank CDs Depreciation of CD image burner Salary of factory manager Factory supplies used Paper inserts for CD cases CD plastic cases Salaries of sales representatives Salaries of factory maintenance employees Salaries of employees who burn music onto CDs Classify each cost as a period or a product cost. Within the product cost category, indicate whether the cost is part of direct materials (DM), direct labor (DL), or manufacturing overhead (MO).