Brian is Paul’s father. In January this year, Paul orally agreed withBrian to decorateBrian’s apartment at cost. Subsequently, they signed a written agreement, which reflected all the terms that they had agreeD、InApril, Paul completed the decoration. However,Brian has refused to pay to Paul the cost.Required:In relation to contract law, advise Paul as to whether he can commence legal action againstBrian to recover the cost. (10 marks)