Which of the following technologies enables voice and data communications over the internet?

The correct response is based on the function of Voice over Internet Protocol (VoIP), which is specifically designed to facilitate voice communications using the internet. VoIP converts voice signals into digital packets that are transmitted over IP networks. This technology allows users to make voice calls using the internet, rather than relying on traditional telephone lines or cellular networks, enabling flexibility and cost savings, particularly in long-distance communication.

VoIP not only supports voice but can also be integrated with video and data services, making it a versatile solution in modern communication systems. The widespread adoption of VoIP has transformed how people communicate, enabling services like Skype, Zoom, and many other internet-based calling solutions.

In contrast, other mentioned technologies focus on different methods of communication. ISDN (Integrated Services Digital Network) is a traditional telecommunication technology that provides digital transmission but does not directly leverage the internet for voice and data integration. Satellite communication involves transmitting data via satellite systems, often used in remote areas but not specifically tied to internet-based communications. The Public Switched Telephone Network (PSTN) represents the traditional telephone network which relies on circuit-switched technology and does not utilize the internet for transmitting voice and data in a modern sense.