Finish the following sentence with the best choice: What is a creative way I can make a shelf cheaply?

Choices:
- Use old drawers from old unused desks and chests, attach to the wall through the back of it.
- Use old drawers from old unused desks and chests, attach to the wall through the front of it.

Answer:
Use old drawers from old unused desks and chests, attach to the wall through the back of it.