Classify the following costs as period or traceable costs.

Depreciation on office building                    Depreciation on factory
Insurance expense for factory building        Bonus to factory workers
Product liability insurance premium            Salary to marketing staff
Transportation charges for raw materials    Administrative expenses
Factory repairs and maintenance                 Bad debt expense
Rent for inventory warehouse                       Advertising expenses
Cost of raw materials                                    Research and development
Factory wages                                               Warranty expense
Salary to chief executive officer                    Electricity for plant