Which of the following best defines a sales contract?

A sales contract is a legally binding document that clearly outlines the terms and conditions of a sale between a buyer and a seller. This contract typically includes essential details such as the purchase price, the description of the goods or services being sold, payment terms, and any contingencies that may affect the sale. Because it constitutes a binding agreement, both parties are legally obligated to adhere to its terms. This provides security and clarity for both the buyer and seller in the transaction.

The other options do not fulfill the requirements of a sales contract. A verbal agreement may indicate intentions but lacks the formalities necessary to be legally enforceable. An informal understanding, similar to a verbal agreement, does not have the completeness or structure of a legally binding document. A letter of intent typically expresses a preliminary commitment, indicating that parties are interested in negotiation, but it does not serve as a final or binding agreement like a sales contract does.