Listed below are costs of providing an airline service. Classify each cost as (a) either variable or fixed, and (b) either direct or indirect by selecting the appropriate dropdowns. Consider the cost object to be a flight. Flight attendants and pilots are paid based on hours of flight time. Cost Variable or Fixed Direct or Indirect 1. Depreciation on office equipment 2. Aircraft maintenance manager salary 3. Snacks served on airplanes 4. Pilot wages 5. Customer service salaries 6. Maintenance on airplanes 7. Beverages served on planes 8. Insurance premium on airplanes