John Is Using PowerPoint to Create an Extensive Marketing Presentation

Multiple Choice

John is using PowerPoint to create an extensive marketing presentation and he keeps modifying the same slide layout by adding new placeholders for pictures and adjusting the text indents in the content placeholder. John wants to modify his presentation so he can work more efficiently.
What does John need to do first in order to create a custom slide layout?

A) Click the New Custom Layout button in the Slide Master group.
B) Select the last slide layout in the Master Thumbnails pane.
C) Click Insert New Layout in the Edit Master group.
D) Delete all of the layouts he does not need in the Master Layouts pane.