Consider the following sequence of events: On August 1, Ana (who is not a merchant) mailed Raul a valid offer. Although no consideration was involved, the offer contained the words, "This offer shall be held open until August 7." On August 2, Raul received the offer. On August 3, Ana mailed a revocation of her offer to Raul. On August 4, Raul received the revocation. On August 5, Raul mailed an acceptance of Ana's offer to Ana. On August 8, Ana received the acceptance. Under these facts, when was a contract formed, if at all? a) August 2. b) August c) August 8. d) No contract was formed