Multi-choice problem: Choose from the options at the end, and answer how do you do this: How do you crease a piece of paper.

Choose from: [+] Fold the piece of paper and press down to create a fold, use a cotton ball along the fold to crease the paper.; [+] Fold the piece of paper and press down to create a fold, use your nail along the fold to crease the paper.;
Fold the piece of paper and press down to create a fold, use your nail along the fold to crease the paper.