Nancy loaned Ryan $300, which he now has to return. Amber in turn owed Ryan $500. As a partial payment of the amount, Ryan assigned Amber's debt to Nancy. Which of the following is true of this case

Ryan, as the assignee of the contract, should send a letter to Amber to claim the money. Nancy is the assignor of the contract and should send a notice to both Ryan and Amber. Amber is the obligor in the contract with Ryan and hence can pay the money only to him. Nancy should send a letter to Amber claiming the money, to which Amber has to oblige.