Assignment Problem: Garrett is the manager of Aristo Condos Inc and is in charge of selling vacant units in the Aristo Towers. On October 4, Heilman examined several of the units with Garrett and said he thought the prices a bit high but would think about it. Several days later, on October 7, Garrett sent Heilman an email stating, "I will sell you any one of the units we examined together (numbers 14, 236, 238, or 307) for $275 000. I am sending you all the details by courier." Garrett then sent by courier to Heilman a formal offer containing all of the necessary terms, including the required down payment and acceptable mortgage financing. Later that day after he had received the email message, but before he had received the letter, Heilman emailed Garrett, "I accept your offer with respect to unit 307." Has a binding contract been formed by Garrett's email? In what circumstances might this question become the basis of a dispute between the parties?