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A.
converts voice and video data into a digital signal and transfers it over the Internet.
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B.
converts voice and video data into a digital signal and broedcasts it via a transmitter.
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C.
is a voice over communication system which is cyber-attack proof
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D.
is a circuit-switched data communication system.
Correct Answer: Option A
Explanation
Voice over IP converts voice and video data into a digital signal and transfers it over the Internet.
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