To add a header or footer to your handout, you can use

Answer: Option C

To add a header or footer to your handout in PowerPoint, you can use Option C: The handout master. The handout master allows you to customize how your slides will appear when printed as handouts, including options to add headers, footers, date, page numbers, and other elements that appear on each handout page.
Option A: The title master is used to customize the appearance of slide titles in the slide master view, not for handouts.
Option B: The slide master is used to customize the overall layout and design of slides in the presentation.
Option D: All of above is incorrect because Options A (title master) and B (slide master) do not specifically apply to adding headers or footers to handouts.
Therefore, the correct answer in this context is Option C: The handout master.