Jeff оwns а beаutiful аutоmоbile, a 1999 Toyota Corolla. Mary has offered to buy the car from Jeff on multiple occasions for $20,000, but Josiah has always declined the offer. One night, Mary visited the tavern where she knew Jeff usually spent his evenings relaxing, having dinner, and drinking one beer. Upon her arrival, Mary ordered a beer for herself and a milkshake for Jeff . Mary and Jeff proceeded to make jokes and share a few laughs, and again she offered to buy the car from Jeff. This time, Jeff laughed and agreed, writing out and signing a written agreement to sell the car to Mary for $20,000 on several sheets of paper brought to them by an employee of the tavern. Mary observed what Josiah was doing, and she smiled and nodded numerous times as Jeff completed writing out the terms and then handed the sheets of paper to Mary. Then, Mary signed on the signature line for her that Jeff had placed on the form right below where Jeff placed his signature. The next morning, Mary showed up at Jeff’s house with her check to Jeff for $20,000, but Jeff insisted that the contract was invalid. Is Jeff right? Why or why not?