To finalize the model of a concave lens, the student should illustrate the light entering the lens and then departing in lines that are spreading out.
Concave lenses cause parallel light rays to diverge after passing through them, making it appear as if the rays are originating from a focal point on the same side as the incoming light. Thus, the correct step is:
The student should illustrate the light entering the lens and then departing in lines that are spreading out.