On January 1, 2020, Brian sends Alice a letter offering to sell her a diamond ring that she likes. In his offer he says, "you must accept before January 15, 2020." On January 5, 2020, Brian sends another letter stating that the offer is revoked because he already sold it, and Alice receives this letter on January 11, 2020. However, she sent a letter to Brain on January 10, 2020 accepting his offer, with a check enclosed. Alice sues Brian. What are the issues and rule(s) of law; analyze the rule(s) with the facts, and who wins in court? Why?