You plan to give an on-site presentation. The external display available for your audience is a 42-inch flat panel monitor. You need to ensure that the presentation on the monitor of your computer is duplicated on the external monitor for the audience.
What should you do?（）

You connect your computer to a multimedia projector. When you play a video, you cannot hear the audio.
You n eed to ensure that the projector provides audio and video playback.
 What should you do?（）