John and Jack are both trying to sell a used car to Jim. John's car is a lemon, a car that has a serious but nonobvious problem. Jack's car is a cherry, a car that has no problems. Jim cannot tell the difference between the cars. Economists say this information problem might be solved with signaling. Who has an incentive to find a way to signal quality?

Both Jack and John

Jack but not John

John but not Jack

Jim