The lets you see what styles have been applied to specific parts of a document, such as headings.
a. quick access toolbar
b. document summary dialog box
c. recent actions menu
d. reveal formatting task pane

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Placeholders  are the containers in  layouts  that hold such content as  text  (including body  text, bulleted lists, and titles),  tables,  charts, smartart graphics, movies, sounds, pictures, and clip art.  slide layouts  also contain the theme (colors, fonts, effects, and the background) of a  slide.