Which postal service provided by the USPS is considered the most secure option?

Registered Mail is deemed the most secure option provided by the USPS because it includes several features specifically designed to protect valuable items during transit. This service offers high-level security measures, such as being tracked at each step of the delivery process, requiring a signature upon delivery, and having insurance options available for valuables. Registered Mail items receive careful handling and are often retained in a secure area within the post office until they are delivered.

Moreover, the entire process of Registered Mail is documented, providing a thorough trail from the point of dispatch to the final delivery. This level of tracking and security makes it the preferred choice for sending important or valuable documents and items, ensuring peace of mind for both the sender and the recipient.