)which one of the following statements best describes the operation of a heat engine?
a) a heat engine performs work and generates an equal amount of thermal energy in a cyclic process.
b) a heat engine decreases the entropy of the universe by generating an equal amount of heat and work.
c) a heat engine uses input heat to perform work and rejects excess thermal energy to a lower temperature reservoir.
d) a heat engine transfers thermal energy from a lower temperature reservoir to a higher temperature reservoir through work performed on the system.
e) a heat engine transfers thermal energy from a higher temperature reservoir to a lower temperature reservoir through work performed on the system