Mark the option/button in the following image of the File tab to mark a presentation as final.

Answer:

Explanation:
The Mark as Final command is used to mark a presentation as read-only. The Mark as Final
command does not provide security feature. If a user receives a presentation marked as final, he can
reverse the Mark as Final status and edit the presentation. The Mark as Final icon in the status bar at
the lower-left side of the PowerPoint window can be used to determine whether a presentation is
marked as final. The icon disappears from the
status bar when a presentation is unmarked. Take the following steps to mark a presentation as final:
1.Open the presentation to mark it as final. Click the File tab.