There Are Basic Principles That Apply to a Network

There are basic principles that apply to a network.Which of the following is not one of these principles?

A) Each computer on a network must have a network interface
B) There is some sort of communication media on the network that connect to all the hardware devices
C) Each computer must have software that supports the movement of information in and out of the computer
D) Each computer is able to have different conversations at the same time with other computers on the network