In 2012,Alder Inc

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

A) Dell cannot introduce oral evidence in court since it violates the parol evidence rule.
B) Dell can introduce evidence of the payment under the exception to the parol evidence rule.
C) Dell violated the best evidence rule,hence cannot produce evidence in court.
D) Dell can exclude parol evidence because wire transfers and cashier's checks are identical.