You Want to Construct a Perfect Refrigerator from a Perfect

You want to construct a perfect refrigerator from a perfect heat engine.What else do you need?

A) You need a second perfect heat engine.
B) You need a nonperfect heat engine.
C) You need a nonperfect refrigerator.
D) You need nothing else.A perfect refrigerator is just a perfect heat engine run backward.
E) A perfect refrigerator cannot be constructed even if you have a perfect heat engine.