Which of the following is NOT a form of contract?

A handshake agreement is often considered a form of contract in legal terms, known as an informal or oral contract. It represents a mutual understanding and intention between parties to enter into an agreement, even if it lacks formal documentation. While handshake agreements can be legally binding, their enforceability may depend on the agreement's nature and the jurisdiction's laws.

Verbal contracts, contracts made by exchanging letters, and legally drawn-up documents are all clearly defined forms of contracts. Each has distinct characteristics that can be used to establish contract terms, enforceability, and the expectations of the parties involved. Verbal contracts involve spoken agreements, written letters can exchange offers and acceptances, and detailed legal documents usually provide a comprehensive record of the terms and conditions agreed upon.

Recognizing that a handshake alone lacks some of the formalities and evidentiary support provided by written contracts helps clarify why it may not be viewed as a standalone form of contract in the same way as the other listed options.