Mailing by registered or certified mail requires

• A. Mailing by private courier.
• B. Mailing in conformity with USPS requirements for registered or certified mail.
• C. Mailing by express mail.
• D. Mailing by first class mail.

Answer: (B)

When a document must be sent using registered or certified mail, you have to follow the USPS procedures for those services. This ensures there is verifiable proof of mailing (and delivery if required), such as a tracking number and receipts or a return receipt. Other options don’t fit because a private courier, express mail, or plain first-class mail doesn’t constitute the required USPS registered or certified service and its accompanying proof.