Under the sales article of the ucc, when a written offer has been made without specifying a means of acceptance but providing that the offer will only remain open for ten days, which of the following statements represent(s) a valid acceptance of the offer? i. an acceptance sent by regular mail the day before the ten-day period expires that reaches the offeror on the eleventh day. ii. an acceptance faxed the day before the ten-day period expires that reaches the offeror on the eleventh day, due to a malfunction of the offeror's printer.