Which statement(s) below is/are invalid? Processes can occur in a certain direction only, not in any direction. A process must proceed in the direction that complies with the increase of entropy principle. ) Entropy is a conserved property, and there exists a conservation of entropy principle. C) Entropy generation (Sgen) is a measure of the magnitudes of the irreversibilities during a process. D) Entropy may be transferred by heat transfer and mass transfer. (E) None of the above.