Which of the following could be the last document in a 'battle of the forms'?

In a 'battle of the forms', both buyer and supplier exchange documents with conflicting terms. The general rule is that the terms of the last document exchanged before performance (e.g., delivery or payment) that is not objected to will govern the contract. An order acknowledgement from the supplier with its own terms, followed by acceptance (e.g., payment), usually constitutes the final word.