Determine Whether Each of the Following Is Classified As

Determine whether each of the following is classified as:
DM: Direct materials
DL: Direct labor
MO: Manufacturing overhead
_____ 1. Assembly line workers' wages.
_____ 2. Factory supervisors' salaries.
_____ 3. Steel used in manufacturing product.
_____ 4. Insurance on factory building.
_____ 5. Rivets and screws used in production.
_____ 6. Tires used in manufacturing vehicles.