A refrigerator is kept running with its door wide open in the middle of a closed, well-insulated room. After a long time, what will happen to the average air temperature inside the room?
(a) It will remain exactly the same because the room is insulated from the surroundings.
(b) It will be higher than the initial temperature because the refrigerator rejects more heat to the room than it removes.
(c) It will be lower than the initial temperature because the refrigerator removes heat from the air.
(d) It will first decrease slightly and then stay constant once the air inside the refrigerator is cooled.