What printing style on passports provides a slightly raised feel?

Intaglio printing is the correct choice because it involves engraving designs into a plate, which then holds ink in the recessed areas. When the plate is pressed onto the paper, the ink is transferred in a way that creates a distinctive raised texture on the surface of the printed material. This technique produces not only a tactile feel but also high-quality, intricate detail, making it difficult to replicate.

In contrast, digital printing utilizes modern technology to print directly onto the substrate without the tactile qualities associated with intaglio. Offset printing involves transferring ink from a plate to a rubber blanket and then to the printing surface, resulting in a smooth finish without the raised feel that intaglio offers. Screen printing, while allowing for bold colors and designs, does not provide the unique tactile characteristics found in intaglio printing. Thus, intaglio printing's process is specifically responsible for the slightly raised feel on passports.