Step 1: Analyze the key features described: it's an intaglio process, it replaces acid, and it uses light (U.V.) and water.
Step 2: Evaluate the options. The term for this modern, non-toxic printmaking method is Solarplate printing. It uses a steel plate coated with a light-sensitive polymer. A transparency with an image is placed on the plate and exposed to UV light (from the sun or an exposure unit). The plate is then "developed" with water, washing away the unexposed polymer and leaving an intaglio plate that can be inked and printed like a traditional etching, but without the use of hazardous acids.