Identify a true statement about a firm offer.

It specifies that parties to a sale$-$of$-$goods contract may not make binding modifications to it without both parties giving new consideration.

It relates to the rules of consideration or supply under the Uniform Commercial Code.

It exists when a merchant offering goods promises in writing that the offer will not be revoked for a period not to exceed three months.

It fails to bind the merchant, although the offeree buyer gives consideration to support it$.$