A(n) ________ states the source of unoriginal content that appears in a presentation

Demoware is a version of commercial software that is distributed as a(n) ____________________ version.

Fill in the blank(s) with the appropriate word(s).

When you install PowerPoint, the default setting allows you to reverse up to the last ____ changes by tapping or clicking the Undo button on the Quick Access Toolbar.

A. 2 B. 20 C. 12 D. 200