The correct answer is D. Transmission Control Protocol/Internet Protocol.
TCP/IP is a set of protocols that allow computers to communicate with each other over the internet. It is a layered protocol, which means that it is made up of several layers, each of which performs a specific function. The layers are:
- Application layer: This layer is responsible for the applications that use the internet, such as web browsers and email clients.
- Transport layer: This layer is responsible for ensuring that data is delivered reliably from one computer to another.
- Internet layer: This layer is responsible for routing data through the internet.
- Network access layer: This layer is responsible for communicating with the physical network, such as a wired or wireless network.
TCP/IP is a very important protocol because it allows computers to communicate with each other over the internet. It is a complex protocol, but it is essential for the internet to function.
The other options are incorrect because they do not accurately represent the full form of TCP/IP.