In 2012, Alder Inc. (seller) and Idyll Inc. (buyer) signed a long-term sales contract that provided for cashier's check payments to be made by Idyll on the first of each month. In 2015, Idyll began using a wire transfer payment method, and now Alder asserts that Idyll is in breach of contract. Which of the following is true?

A. Idyll can introduce evidence of the payment under the exception to the parol evidence rule.

B. Idyll can exclude parol evidence because wire transfers and cashier's checks are identical.

C. Idyll violated the best evidence rule and thus can't produce evidence in court.

D. Idyll can't introduce oral evidence in court since it violates the parol evidence rule.