Classify each of the following independent costs as a product or period costs and whether they are variable cost or fixed cost: A. Depreciation using the units of production method on packaging equipment. B. Sheet aluminum used in making airplanes. C. Wages of assembly line workers. D. Salaries of plant security guards. E. Insurance for employees on the automotive assembly line. F. Straight-line Depreciation on the corporate office building. G. Factory heating costs. H. Adverting costs incurred by Adams Cable Company. 1. Wages of finished goods quality inspectors at a breakfast cereal processor. J. President's Salary of a wheat mill