A car manufacturer incurs the following costs. Classify each cost as either a product or period cost. If a product cost, classify it as direct materials, direct labor, or factory overhead. If a period cost, classify it as a selling expense or a general and administrative expense. Costs Cost Classification Advertising Salesperson smartphone costs Property taxes on factory building Office building insurance used up Wages to assembly workers Salesperson commissions Steel for cars Depreciation on office equipment Salesperson travel costs Steering wheels used in cars