Classify each of the following costs as Product (direct/indirect) or Period and Variable, Fixed or Mixed. Product (Direct/Indirect) Variable/Fixed Costs Wages of assembly-line workers Depreciation of plant equipment Glue and nails for production Outbound delivery expense Raw materials handling costs Salary of marketing manager or Period Product-direct /Mixed Variable Product-indirect Fixed Variable Variable Period Fixed Production run setup costs Administrative office utilities Period Electricity cost of retail stores Mixed Research and development expense Period Mixed Classify each of the following costs as Product (direct/indirect) or Period and Variable, Fixed or Mixed. Costs Wages of assembly-line workers Depreciation of plant equipment Product (Direct/Indirect) Variable/Fixed or Period Product-direct Product-indirect /Mixed Variable Fixed Variable Glue and nails for production Outbound delivery expense Raw materials handling costs Salary of marketing manager Production run setup costs Administrative office utilities Electricity cost of retail stores ariable Period ixed Product-direct Product-indirect Mixed Research and development expense Period Mixed