The Internet is based on the following three key technologies:

The answer is correct as it identifies the essential technologies that form the foundation of the Internet. Client/server computing represents the network model where clients request resources and services from servers, allowing for efficient resource distribution and management. Packet switching is a method of data transmission where messages are broken down into smaller packets that are sent independently across the network and reassembled at the destination, which enhances efficiency and reliability in data communication.

Additionally, the development of widely used communications standards is crucial because they provide a common framework for different devices and networks to communicate effectively. This interoperability is what enables diverse systems to connect and share information seamlessly over the Internet.

The other options, while they mention important technologies, do not encompass the breadth of foundational concepts that enable the Internet to function as a global network. For example, TCP/IP, HTTP, or HTML alone do not capture the architectural and operational principles of client/server models and packet switching.