Here is a goal: How to prevent a nail from growing into skin?

Which way makes more sense to accomplish this goal?

OPT: --When you prepare to cut the fingernail, make sure that you cut flat and straight near the corners so the edge of the nail is sharp --When you prepare to cut the fingernail, make sure that you cut on an angle near the corners so the edge of the nail is rounded
When you prepare to cut the fingernail, make sure that you cut on an angle near the corners so the edge of the nail is rounded