The correct answer is C. Slide master.
The slide master is a slide that contains the placeholders and formatting for all the slides in a presentation. You can use the slide master to change the overall look and feel of your presentation, such as the fonts, colors, and background. You can also add placeholders for text, images, and other objects that will appear on all the slides in your presentation.
To access the slide master, click on the View tab and then click on Slide Master in the Master Views group.
The slide master is a powerful tool that can help you save time and create a consistent look and feel for your presentations.
A. Slide shows is not a feature that can be used when typing in the notes text box. Slide shows are a way to view your presentation on a computer or projector.
B. Insert is a feature that can be used to add text, images, tables, charts, and other objects to your presentation. However, it cannot be used when typing in the notes text box.
D. Zoom is a feature that can be used to enlarge or reduce the size of your presentation on the screen. However, it cannot be used when typing in the notes text box.