Answer:
3.
Step-by-step explanation:
Co-authoring in PowerPoint is sharing a presentation and allowing your colleagues to work on it at the same time. This option of co-authoring is available when you share or save your file on OneDrive or SharePoint.
The perk of co-authoring a presentation is that PowerPoint keeps a record of all edits under the name of the author. This keeps the conflicts away.
Therefore, the correct answer is option 3.