The final step before stapling or binding your paper is

 The correct answer is : proofread the entire paper

Explanation:   If you are going to staple, you should check: the number of pages that do not exceed the maximum allowed, size and type of paper that can be stapled. If you are going to bind, you should also make some previous revisions such as: see that the spine does not exceed the maximum thickness allowed, check the size of the book block and the type of paper in the book block.

3 is blunder, i’m not sure about the last one but the first two look correct

they are direct opposites. they can both be corrupted. they are inseparable.