Indicate whether each of the following should be considered a product cost or a period cost. If you identify the item as a product cost, also indicate whether it is a direct or an indirect cost. For instance, the answer to the Example item is "indirect product cost." Example: Property taxes on factory building. a. Cost of disposal of hazardous waste materials to a chemical plant. b. Amounts paid by a mobile home manufacturer to a subcontractor who installs plumbing in each mobile home. c. Depreciation on sales showroom fixtures. d. Salaries of security guards in an administrative office building. Williams, Jan. Financial & Managerial Accounting (p. 743). McGraw-Hill Higher Education. Kindle Edition.