Which of the following cools the air in a household refrigerator?
a. reduction of the air temperature due to condensation of the gaseous refrigerant
b. absorption of the heat from the air due to evaporation of the liquid refrigerant
c. the transfer of heat to the evaporator due to compression of the liquid refrigerant
d. the transfer of heat from the air to the compressor due to expansion of the gaseous refrigerant

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