Identify each cost as either direct materials, direct labor, factory overhead, selling expenses, or general and administrative expenses by selecting the appropriate dropdowns. 1. Maintenance of assembly equipment 2 Assembly-line supervisor salary 3 Depreciation (straight-line) on robotic equipment used in assembly 4 Salary of the chief executive officer 5 Quality control supervisor salary 6. Wages for retail store worker 7 Memory card 8 Wages for packaging workers Factory overhead