Step 1: Define relief printing. This method involves printing from a raised surface, where the non-printing areas have been cut away.
Step 2: Analyze the given techniques.
Wood cut and Lino cut are classic relief techniques where a block is carved.
Letterpress is a mechanized form of relief printing using movable type.
Engraving (Metal) is an intaglio technique. The image is incised into a metal plate, and the ink is held in these recessed lines, not on the raised surface.
Therefore, metal engraving is not a relief technique.