All notices of liens must be sent using which method?

The correct choice is certified mail because this method provides a reliable and verifiable way to send notices of liens. By using certified mail, the sender receives proof of mailing, and the recipient must sign to acknowledge receipt. This is essential in legal matters like liens, as it ensures that there is a documented trail showing that the notice was delivered, which can be crucial in case of disputes or legal proceedings.

Regular mail, while commonly used, does not provide the same level of assurance regarding delivery and receipt. Email and fax, although they may offer speed and convenience, lack the formal legal status and verifiability that certified mail provides in the context of legal notices. Therefore, sending notices of liens via certified mail safeguards the sender's interests and ensures compliance with legal requirements.