Question 1: Product and perlod costs a) In a manufacturing firm, product costs Include: O all variable costs O all non-manufacturing costs O all fixed costs O all manufacturing costs O all GAAP costs period costs include: O all variable costs O all non-manufacturing costs O all manufacturing costs O all non-GAAP costs O all fixed costs b) Classify the following items as product or period costs: Rent for the factory building Rent for the sales office Depreciation on production equipment Depreciation on sales office equipment Production supervisor's salary Marketing manager's salary Assembly workers' wages Materials used in production Office supplies used in the customer service department product product Operiod Oproduct Operiod product Operiod product Operiod product Operiod product period product period product period period