Exercise 14-6 Cost classification LO C3 Tesla, a vehicle manufacturer, incurs the following costs. (1) Classify each cost as either a product or a period cost. If a product cost, identify it as direct materials, direct labor, or factory overhead, and then as a prime and/or conversion cost. (2) Classify each product cost as either a direct cost or an indirect cost using the product as the cost object. (Leave no cell blank if there is no effect select "NA - Not a product cost".) Cost by Traceability Period or Product Direct material, Direct labor, or Factory Overhead Prime or Conversion Direct or Indirect 1. Factory electricity 2. Advertising 3. Amortization of patents on factory machine 4. Batteries for electric cars 5. Office supplies used 6. Wages to assembly workers