Final answer:
Rembrandt's etching is distinguished by the use of a metal plate.
Step-by-step explanation:
When comparing prints by Albrecht Dürer and Rembrandt, what distinguishes Rembrandt's print as an etching is the use of a metal plate. Rembrandt's etchings were created by applying a protective wax-based coating to a metal plate, scratching an image into the plate, submerging it in an acid bath, and then removing the protective coating. The resulting image is created from the ink in the etched channels of the metal plate.