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

A valid contract is generally defined by several key elements, which include consideration, mutual consent, and the capacity of the parties to contract. While a written form can be beneficial and may be required in specific contexts or for certain types of contracts (such as real estate transactions), it is not universally necessary for all contracts to be valid.

Consideration refers to something of value exchanged between the parties, which is essential for a contract to be binding. Mutual consent, or an agreement between the parties on the terms of the contract, ensures that both understand and accept the obligations stipulated. Capacity to contract ensures that the parties involved have the legal ability to enter into a contract, meaning they are of age and sound mind.

Because there are numerous scenarios in which contracts can be formed orally or implied through actions, the lack of a written form does not inherently invalidate a contract in every case. Thus, the requirement for a written contract is situational and not a universal necessity, making it the correct choice for this question.