Two colleagues must co-author an operations manual simultaneously. Which Microsoft 365 workflow best supports real-time collaborative editing with both users seeing each other's changes live?

1. Store the document in OneDrive or SharePoint and have both users open and edit it online (or in the desktop apps with AutoSave on)
2. The first user edits, prints the file, and the second user scans it back
3. Both users rename their copies with 'final' and exchange them by e-mail until the versions match
4. One user reads the document aloud over the phone while the other retypes it