Each of the following would be a period cost except: (LO# 2&3) Select one: a. the cost of a general accounting office. b. depreciation of a machine used in manufacturing. c. sales commissions. d. the salary of the company president's secretary. Which of the following. would NOT be treated as a product cost for external financial reporting purposes Select one: a. Salaries of factory workers. b. Indirect labor in the factory. o c. Advertising expenses. d. Depreciation on a factory building