Which of the following is NOT a requirement for a valid contract?

A valid contract requires several essential elements to ensure its enforceability. Among these elements are mutual agreement, which necessitates that both parties have a clear understanding and acceptance of the terms; legal capacity, meaning that the parties involved must have the ability to enter into a contract, typically being of legal age and sound mind; and consideration, which refers to something of value that is exchanged between the parties, forming the basis of the contract.

Written documentation is not universally required for the validity of a contract. While certain types of contracts, such as those involving real estate transactions or agreements that cannot be performed within one year, must be in writing to be enforceable under the Statute of Frauds, many contracts can be valid even if they are oral or implied. Thus, the absence of a written document does not invalidate a contract, making it the correct answer in identifying which option is NOT a requirement for a valid contract.