Presented below is a list of costs and expenses usually incurred by barnum corporation, a manufacturer of furniture, in its factory. classify the below items into the following categories: (a) direct materials, (b) direct labor, and (c) manufacturing overhead. item category 1. salaries for assembly line inspectors. select a category 2. insurance on factory machines. select a category 3. property taxes on the factory building. select a category 4. factory repairs. select a category 5. upholstery used in manufacturing furniture. select a category 6. wages paid to assembly line workers. select a category 7. factory machinery depreciation. select a category 8. glue, nails, paint, and other small parts used in production. select a category 9. factory supervisors’ salaries. select a category 10. wood used in manufacturing furniture.