At the beginning of the year, Ayayai Inc. is considering whether to repair and retain an existing machine, or to replace it with a new machine. The following information is available to analyze this decision: Machine overhaul costs (last year) $7000 Repair costs (current year) 2900 Annual operating costs (existing machine) 13200 Annual operating costs (new machine) 9200 Which of the costs being considered for this decision represents a sunk cost? O $13200 of annual operating costs (existing machine) O $7000 of Machine overhaul costs (last year) O $2900 of repair costs (current year) O $9200 of annual operating costs (new machine)