Selected costs related to Apple's iPhone are listed below. Classify each cost as either direct materials, direct labor, factory overhead, selling expenses, or general and administrative expenses. 1. Assembly-line supervisor salary 2. Glue to hold iPhone cases together 00:13 3. Wages for employees who maintain assembly equipment 4. Wages for assembly workers ok 5. Wages for factory equipment operators nces 6. Microphone component 7. Depreciation on office equipment. 8. Camera component Factory overhead Direct materials Director General and administrative expense Selling Expense