Joe Baker is a renowned pastry chef. Caf, a sole proprietorship, is a well-known restaurant in need of hiring a pastry chef. Joe Baker and Caf's Owner had extensive conversations regarding Baker coming to work at Caf. On May 1, a week after those conversations occurred, Joe Baker sent Caf a signed letter dated May 1 stating: "I will work for Caf as head pastry chef for two years for an annual salary of $100,000."

On the morning of May 7, Caf's Owner telephoned Joe Baker and said: "The $100,000 is pretty stiff. Could you possibly consider working for less?" Joe Baker replied: "I am a renowned pastry chef. I will not work for any less!"

Later that morning, Caf's Owner sent Joe Baker a signed letter by regular mail stating: "You obviously think you are too good for my restaurant. I am no longer interested in hiring you to work at Caf."

Later that afternoon, Caf's Owner had a change of heart and sent Joe Baker a registered, expressmail signed letter stating: "Okay, if you really won't work for less, I agree to pay you the $100,000 a year you demand to work as head pastry chef at Caf for two years."

On May 10, the registered, express-mail letter was delivered to Joe Baker's office. The regular-mail letter containing the rejection was still on its way. Joe Baker accepted delivery of the registered, express-mail letter from the postal carrier and placed it on his desk without opening it.

On May 11, before Joe Baker read the registered, express-mail letter on his desk, he accepted an offer to work for Restaurant. As a courtesy, Baker called Caf's Owner and said, "Sorry, I just took a job at Restaurant. Too bad you couldn't afford me." Caf's Owner responded, "You can't work for Restaurant, I already accepted your offer to work at Caf for $100,000 a year."

Does Caf have an enforceable contract with Joe Baker? Explain.