Shira, Inc., is considering replacing equipment. The following data are available: Old Equipment Replacement Equipment Original cost $ 50,000 $ 40,000 Disposal value now $ 8,000 0 Disposal value in 5 years 0 Annual cash operating costs $ 9,000 $ 8,000 Which of the data above is a sunk cost? The annual cost of operating the new equipment. The annual cost of operating the old equipment. The disposal value of the old equipment. O The original cost of the old equipment