8. Which of the following thermodynamics statements is (are) correct?(AB) A closed system cannot exchange energy with the surroundings.(AC) The work done by a construction worker. weighing 60 kg, who climbs to the roof a 50-m tall building is about 29 kJ.(AD) Asystem at lower temperature has a greater intemal energy than the same system at a higher temperature.(AE) The internal energy of molecules is stored only as molecular potential energy.(BC) The total motional contribution to the molar internal energy of gascous H2O at 25℃is 7.43 kJ/mol.(BD) The equipartition theorem states that every degree of freedom that appears only quadratically in the total energycontributes R to the system's heat capacity.