Blankenship Company, maker of wood shelving, incurred the following cost during the current year. Is the following cost item a product cost or a period cost? Depreciation on automobiles used by the sales staff. O Period Product Blankenship Company, maker of wood shelving, incurred the following cost during the current year. Is the following cost item a product cost or a period cost? Salary of Blankenship's chief executive officer Period Product Blankenship Company, maker of wood shelving, incurred the following cost during the current year. Is the following cost item a product cost or a period cost? Salary of company controller O Product Period Blankenship Company, maker of wood shelving, incurred the following cost during the current year. Is the following cost item a product cost or a period cost? Salary of company controller O Product Period Blankenship Company, maker of wood shelving, incurred the following cost during the current year. Is the following cost item a product cost or a period cost? Supplies for factory washroom O Product Period