Concept:Voice over IP (VoIP) is a technology that sends voice and video data as digital signals over the Internet.
Explanation:In VoIP, analogue voice or video is first converted into digital data packets.
These digital signals are then transferred over the Internet or an IP-based network.
Option B is false because VoIP does not broadcast signals through a transmitter.
Option C is false because no online system is fully cyber-attack proof.
Option D is false because VoIP uses packet-switched communication, not circuit-switched systems.
Therefore, the correct statement is the one that describes digital conversion and Internet transfer.
Answer:Option A. VoIP converts voice and video data into a digital signal and transfers it over the Internet.