What form is used for items that require a signature?

The correct form used for items that require a signature is the PS 3813-P. This form specifically facilitates the process of obtaining a signature confirmation for mail services, ensuring that the recipient acknowledges receipt of the item. The form serves as a record of delivery, which is essential for both the sender and the recipient, particularly for valuable or important documents that necessitate proof of delivery.

Understanding the importance of signature-required forms is critical in postal operations, as they enhance security and accountability in the mail delivery process. The PS 3813-P thus plays a vital role in maintaining the integrity of the postal service and provides assurance that sensitive items reach their intended destinations safely.

On the other hand, the other forms listed do not serve the same purpose. They are intended for different postal processes and do not specifically focus on signature confirmations for delivered items.