Finish the following sentence with the best choice: How can I safely cut sheet metal with a hacksaw?

Choices:
- Cut sheet metal cleanly with a hacksaw by sandwiching the metal between two thin paper towels. Mark your pattern on the front paper towel, clamp the sandwich in a vise, then saw on the marks through the entire sandwich at once.
- Cut sheet metal cleanly with a hacksaw by sandwiching the metal between two thin boards. Mark your pattern on the front board, clamp the sandwich in a vise, then saw on the marks through the entire sandwich at once.

Answer:
Cut sheet metal cleanly with a hacksaw by sandwiching the metal between two thin boards. Mark your pattern on the front board, clamp the sandwich in a vise, then saw on the marks through the entire sandwich at once.