A refrigeration system requires 1.3 kW of power for a refrigeration rate of 3 kJ.s¹ and a heat rejection at 60 °C. Calculate the coefficient of performance and lowest temperature the system can possibly operate at. a) 4.30, 232.18 K b) 2.30, 232.18 K c) 2.30, 352.18 K d) 3.30, 252.18 K