Rene contracts with Scot to pay him $5,000 for repairs to Rene's lake cabin. After Scot performs, Rene tells him that she cannot pay him in full immediately. They sign an agreement in which Rene promises to pay $2,500 now instead of $5,000 later. This is Select one: a. a mutual agreement to rescind. b. an accord and satisfaction. c. a novation. d. specific performance