The difference in brightness between two objects on a slide, such as the background and text., is called ________

Match the following video file formats with their description:

I. stores synchronized multimedia data A. Movie file-.mpg or .mpeg file II. compresses audio and B. Windows Media Video file-.wmv file video; requires minimal storage III. format generally used to C. Adobe Flash Media file-.swf file deliver video over the Internet IV. stores sound and moving D. Windows Media file-.asf file pictures in RIFF format V. designed for use with Video-CD E. Windows Video file-.avi file and CD-i media

How many header elements are available to choose from in XHTML?

A) unlimited B) 5 C) 6 D) 4