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Marv's Furniture and Fixtures produces seats for movie theaters. Listed below selected cost items for the seat production. Classify each cost as either fixed or variable, and efither a product or a period cost by placing an x in the appropriate boxes. are Cost by behavior Cost by function Variable Fixed Product Period Fabric for seats.... Assembly labor.... Factory property taxes. Accounting staff salaries.... Sales office rent... Sales manager's salary... Depreciation equipment... on factory Sales commissions