Which of the following provides a proof posting and that the item has got to the addressee?

Recorded delivery provides a proof of posting and delivery of an item to the addressee. When an item is sent via recorded delivery, the sender receives a receipt as proof of posting, and the addressee must sign to confirm receipt of the item upon delivery. This provides evidence that the item has been delivered to the intended recipient, which can be important for legal or financial documents. Certificate of posting, registration letter, and express letter do not provide the same level of proof of delivery as recorded delivery.