Which of the following BEST describes VoIP (Voice over Internet Protocol)?
A protocol optimized for voice data transmission (telephone calls) through a wireless network.
A protocol optimized for voice data transmission (telephone calls) through a 5G switched IP network.
A series of protocols optimized for voice (telephone calls) and digital data transmission through a packet-switched IP network.
A protocol optimized for voice data transmission (telephone calls) through a packet-switched IP network.