Which of the following statements can be classified as refrigeration (|) Maintaining a closed space at a temperature of 100 F when surroundings are at a temperature 50 °C (\l) Reducing the temperature of a body from 50 °C to 40 °C when the surrounding temperature is 35 °C. (Ill) Reducing the temperature of a food item in open atmospheric conditions from some initial temperature to 15 °C when the surrounding temperature is 0 °C. (IV) Decreasing the temperature of a room from 37 °C to 20 °C when the outdoor temperature is 40 °C.

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