4. From the choices presented in parentheses, choose the appropriate term for completing each of the following sentences: a. Advertising costs are usually viewed as (period, product) costs. b. Feedback is often used to (improve, direct) operations. c. Payments of cash or the commitment to pay cash in the future for the purpose of generating revenues are (costs, expenses). d. A product, sales territory, department, or activity to which costs are traced is called a (direct cost, cost object). e. The balance sheet of a manufacturer would include an account for (cost of goods sold, work in process inventory). f. Factory overhead costs combined with direct labor costs are called (prime, conversion) costs. g. The implementation of automatic, robotic factory equipment normally (increases, decreases) the direct labor component of product costs