What is defined as electronic equipment connected by cable to the CPU of a computer?

A peripheral is any external device that connects to the central processing unit (CPU) of a computer to provide additional functionality or capabilities. This broad category includes both input and output devices, which are crucial for interaction with the computer. For instance, peripherals encompass devices such as keyboards, mice, printers, and scanners. They communicate with the CPU via cables (or wirelessly in some cases), allowing data transfer and operational commands between the external devices and the core computer system.

The other options are more specific types of peripherals rather than a general category. Input devices refer specifically to peripherals that allow users to input data into the computer, such as keyboards and mice. Output devices are those that output data from the computer to the user, such as monitors and printers. Display devices are a subset of output devices that specifically present visual data, like monitors or screens. While all these components may fall under the umbrella of peripherals, the term itself captures the entire range of electronic equipment that connects to the computer's CPU.