Please help
Which of the following sentences does not correctly use parallel structure?

The steps of the writing process are prewriting, outlining, drafting, revising, and polishing.
The steps of the writing process are prewriting, to create an outline, writing a first draft, revise, and polishing.
To write an essay, remember to prewrite, outline, always draft, revise, and polish for your best work.
When writing an essay, it's best to create your outline, write your draft, revise for clarity, and finally, polish your work.