multiplexes or separates the data to be transmitted into smaller chunks and then transmitted the chunks on several sub channels.

The correct answer would be a.

Iwould try the first option, first then if that didn't work i would try the last option.

An active cell. a circular reference occurs when a cell in an excel 2010 worksheet refers to itself.

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.