The notes, handouts, and outline must be in landscape orientation.
Mark the option/button in the following image of the Design tab on which you will click to accomplish the task.
Answer: 
Explanation:
Page Setup is used to specify the size of slides, notes orientation, and slide numbering in a presentation. Take the following steps to customize the slide size of a presentation:
Open the presentation on which you want to customize the size. Click on the Design tab and click the Page Setup button.
The Page Setup dialog box opens. Specify the settings for the slide height, width, and orientation.
Click the OK button.
Chapter: PRESENTATION, ADVANCED – LEVEL
Objective: Slides
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