Single/multi-choice problem: Which of the following solutions is better for the following goal:
How to sand the edges of the wooden boards.

Choose from:
- Using sandpaper, go over the panels that are rough with the paper. Keep rubbing until the panels are smooth.
- Using sandpaper, go over the edges that are rough with the paper. Keep rubbing until the edges are smooth.
Using sandpaper, go over the edges that are rough with the paper. Keep rubbing until the edges are smooth.