Which of these statements about postal services is TRUE?

The statement about Registered Mail providing proof of mailing and receipt is true. Registered Mail is specifically designed to offer a higher level of security for valuable items sent through the postal system. It includes tracking and the ability to obtain proof of delivery, as the sender receives a receipt upon mailing, and the recipient must sign for the item upon its arrival. This process is designed to ensure both accountability and the safe passage of important documents or items.

In contrast, the other statements do not accurately represent the characteristics of the mailing services mentioned. First-Class Mail is known for being fast and reliable but does not inherently offer the highest security level compared to Registered Mail. Priority Mail provides quicker delivery than First-Class Mail and is not characterized as the slowest service. Lastly, Express Mail, known for its expedited service, actually has a level of security and tracking that surpasses Standard Mail, making it more secure rather than less.