For each item shown below, indicate whether it is a product cost or a period cost, by placing an X in the appropriate column. For each item that is a product cost, also indicate whether it is a direct cost or an indirect cost with respect to a unit of finished product. Product or Period Cost? Direct or Indirect Cost? Cost Item Product Period Direct Indirect Administrative salaries Direct labor Advertising Property tax on the factory Factory maintenance Direct materials Depreciation on factory equipment Interest expense Factory supplies