Juwan, a $20-$year$-$old neighbour, secured a part$-$time job in a nearby town and needed a car for the commute to work. Since you have two cars, you agreed to sell the older one to him. Juwan offered to pay $$2,000$ immediately and then pay $$250$ per month for the next two years. The amount sounded right, but you were worried about Juwan's ability to actually make the payments. You therefore asked him for a guarantee that his mother would make his payments if he failed to do so$.$ Juwan said, $"$No problem. She helps me out whenever I ask." You and Juwan therefore drafted a contract that required $(1)$ you to transfer the car to him immediately, $(2)$ him to make the payments as agreed, and $(3)$ his mother to make up any payments that juwan missed. This is a case involvingA pre$-$existing obligation.Vicarious performance.A trustA privity of contract problem.Subenit