John puts an advert on an online marketplace stating that he wants to sell his car for $5000. Anthony sees the advert and contacts John for his address. He drives to see the car and after inspecting it, hands him the money.

John accepts the money and says "Congratulations, hope you enjoy the car!" when Steve pulls up at John's home. John had forgotten that he had Steve scheduled to view the car.

Steve gets angry and tells John that he shouldn't have sold the car because they had a verbal agreement.

 

Briefly explain the type of discharge that applies to each of the scenarios and explain your reasoning.