Selected costs related to Apple's iPhone are listed below. Identify each cost as either direct materials (DM), direct labor (DL), factory overhead (FOH), selling expenses, or general and administrative expenses 1. Display screen Assembly-line supervisor 2. salary Wages for assembly 3. workers Salary of the chief 4. executive officer Glue to hold iPhone cases 5. together Uniforms provided for each 6. factory worker Wages for retail store 7. 8. worker Depreciation (straight-line) on robotic equipment used in assembly