Amy signed a promissory note payable to Rose for $100. Assume that the promissory note meets all of the requirements for negotiability. Rose owes $100 to Matt, and she wants to give him the promissory note from Amy to satisfy her debt to Matt. However, if Amy doesn't honor the note and pay Matt, Rose does not want any personal liability to pay him. What type of endorsement should Rose use when she transfers the note to Matt? Explain.