The following is a list of costs that were incurred in the production and sale of large commercial airplanes: Classify each cost as either a product cost or a period cost. Indicate whether each product cost is a direct materials cost, a direct labor cost, or a factory overhead cost. Indicate whether each period cost is a seling expense or an administrative expense. q. Power used by painting equipment r. Prebuilt leather seats installed in the first-class cabin s. Production Quality Control Department costs for the year t. Salaries of Marketing Department personnel u. Salaries of test pilots v. Salary of chief financial officer w. Salary of plant manager x. Special advertising campaign in Aviakson Worid magazine y. Wages of employees that assemble the airplanes z. Yearly cost of the maintenance contract for robotic equipment Product costs-direct materials cost Product costs-direct labor cost Product costs-factory overhead cost Period costs-selling expense Period costs-administrative expense