An offer that requires acceptance by FedEx that is accepted by UPS is a counteroffer and a rejection.

Question

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When an offer specifies a particular mode of acceptance, such as requiring acceptance to be made through FedEx, and the offeree uses a different method, in this case, UPS, it constitutes a counteroffer and a rejection of the original offer. This is because the acceptance did not conform to the terms of the offer, thereby not completing the agreement as initially proposed.

An Offer That Requires Acceptance by FedEx That Is Accepted