Answer:
The answer is Live Preview.
Explanation:
<em>Live Preview is a Powerpoint tool that helps the user to find out how a singular choice will change the appearance of the presentation, without committing any change. This application allows the user to edit any slide and see the changes without any risk of damaging the rest of the presentation.</em>
<em>It lets the user see how an actual change will look on the slide object before the user decides to accept or decline the change.</em>
<em>It is a powerful resource, because we know how handful it is to prepare a powerpoint presentation.</em>
<span>the answer is most likely "Seismograph"</span>
