Which of the following options is NOT a method for written notices to be considered effective?

The correct choice indicates that "None of the above" are considered methods for written notices to be effective. This indicates that all the listed methods—hand-delivery, email, and mailed notices—are valid ways to deliver written communication in the context of real estate transactions.

In many legal frameworks, including those relevant to Texas real estate, hand-delivery ensures that the recipient receives the notice promptly and can acknowledge receipt directly. Email is often used for its efficiency and convenience, provided that both parties agree to its use for official communication. Mailing is a traditional method that allows for a paper trail through the use of certified or registered mail, providing a record of the notice being sent and received.

Since each listed method has legal validity and can effectively convey necessary information in a contractual context, they are all deemed acceptable for ensuring written notices are recognized. Thus, stating "None of the above" accurately reflects that each method provided is indeed valid for effective written notices.