Among the following statements, is invalid. (A) A process is called reversible if the system and all parts of its surroundings cannot be exactly restored to their respective initial states after the process has occurred. (B) Reversible processes deliver the most work or consume the least work. (C) For internally reversible processes, no irreversibilities occur within the boundaries of the system during the process, and no irreversibilities occur outside the system boundaries. (D) During a cycle, a system can be restored to its initial state following a process, regardless of whether the process is reversible or irreversible. (E) In irreversible processes, the surroundings usually do some work on the system and therefore does not return to their original state.