3. Used to arrange information according to main ideas, major details, and supporting details
Explanation:
An outline is used to organize a paper and think about it, it helps the writer see the overall picture. Outlines are characterized for being formal systems, this means they follow rigid format. In this way the organization can be easily followed by anyone, you could say it's an objective way to organize your ideas. Outlines can be used to see if ideas connect and which order is the best to present the information, they also help you see if the information used is supporting in an effective way the main idea.
