Which of the following is not an essential component required for a video-conferencing system?

AVideo camera

BDisplay device

CTelephone ✓ Correct

DMicrophone

Correct answer: (C) Telephone

Explanation

A telephone is not an essential component of a video-conferencing system, since audio and video travel over the network.

A video camera is essential to capture the live picture of participants.

A display device is essential to show the remote participants on screen.

A microphone is essential to capture the speaker's voice.

Video conferencing needs a network connection to carry the data.

Software such as a conferencing application ties these components together.

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