4. Tanya was Ronnie's lawyer for many years. Tanya not only handled legal matters for Ronnie, but also gave him important advice on business matters. At one point, Ronnie owed Tanya about $20,000 for professional services. Tanya suggested that the account could be settled by Ronnie transferring his sailboat to Tanya. Ronnie hesitated at first, but after realizing how indispensable his relationship to Tanya was, he transferred the sailboat. Several years later, Ronnie's daughter, who greatly enjoyed sailing, returned from graduate studies in Europe and persuaded Ronnie to sue for recovery of the sailboat. Assume Tanya and Ronnie live in New Brunswick. a. What is Ronnie's most likely cause of action and what would he need to prove to be successful? (3 marks) b. What could Tanya argue in defense (s)? (4 marks)