When should you use an outline? when writing a final draft when preparing to write a rough draft when editing or revising a piece of writing when publishing a piece of writing

I believe the correct answer is second option: when you are preparing to write a rough draft.

Outline represents a set of guide lines that will represent a general description or plan showing the essential features of something you work on, but not the detail. Therefore, the outline represents the first step of writing and should be used when you are preparing to write a rough draft.