Which of the following statements about a heat engine must be true?   i) Energy is taken in from a cold source and expelled to the hot source  ii) Even an ideal heat engine with no energy loss due to non-conservative forces has an    efficiency lower than 100%   iii) The internal energy of a heat engine must always increase after the process is    complete  iv) The heat engine cannot do more work than the energy taken in A) ii, iii B) ii, iv C) i D) i, ii E) i, iv

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