The correct answer is: A. T/806+PN
T/806+PN is the correct form to be issued on DL for block back. It is a form that is used to authorize the release of a shipment that has been blocked. The form must be signed by the authorized person and must include the date, the name of the shipper, the name of the consignee, the number of packages, the weight of the shipment, and the reason for the block.
B. T/A806+PN is not the correct form to be issued on DL for block back. It is a form that is used to authorize the release of a shipment that has been abandoned.
C. T/B-806+PN is not the correct form to be issued on DL for block back. It is a form that is used to authorize the release of a shipment that has been damaged.
D. None of these is the correct answer.