Discussion
Which of the following is not an essential component, required for video-conferencing system?
Answer: C
The component that is not essential is the telephone.
A video-conferencing system needs a video camera to capture the picture, a microphone to capture sound, a display device to show the other participants, speakers, and a network connection with suitable software or a codec to carry the audio and video between the sites.
A telephone is not needed, since the sound travels with the video over the network, through the system's own microphone and speakers. Video camera, display device and microphone are all essential, so they are the wrong answers.
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