If John sues BCD for the reasonable value of his services, which of the following is the most likely result?
John will lose, because there is an express contractual provision pre-empting the subject of compensation for his services. 
John will lose, because he cannot perform his agreement to assist the customer for six months
John will win, because BCD benefited as a result of John's services. 
John will win, because BCD made an implied-in-fact promise to pay a reasonable commission for services that result in sales. 