Step 1: Define the Intaglio technique. Intaglio printing involves incising an image into a plate. The incised lines or areas hold ink, and the image is transferred from these recessed areas.
Step 2: Analyze the given options.
(C) Mezzotint: This is a classic intaglio technique where the plate is systematically roughened to hold ink and then smoothed to create lighter tones.
(D) Dry point: In this technique, the artist scratches an image directly onto a plate with a sharp needle, creating a burr that holds ink. This is a direct form of intaglio.
(A) Collography: This involves creating a collage on a plate. It can be printed either as an intaglio or a relief print, but it is a distinct category.
(B) Monoprint: This is a planographic technique where an image is created on a smooth surface and then transferred.
The definitive intaglio techniques from the list are Mezzotint and Dry point.