Based on the following, what is the biggest advance of additive manufacturing? (Select all that apply.) As the name implies, 3-D printing produces a three-dimensional object. It starts with a thin layer of powder on a building platform. The powder may be plastic, metal, wood pulp, cobalt, or other materials, or, at some point, human tissue.

Additive manufacturing will permit time travel.
Additive manufacturing might produce skin for burn victims.
Additive manufacturing is rarely sustainable.
Additive manufacturing is purely science fiction.