Which connection method uses short-range radio waves?

The correct choice is based on the functionality and specific characteristics of Bluetooth technology. Bluetooth operates through short-range radio waves, typically within a range of about 10 meters (33 feet). It is designed for low power consumption and is widely used for connecting devices such as wireless headphones, keyboards, and other peripherals to computers and smartphones.

Infrared technology, while also a form of wireless communication, relies on line-of-sight and is not considered a method that uses radio waves. Wi-Fi, on the other hand, utilizes longer-range radio signals and is aimed at providing internet access over broader areas, typically around 30 meters for common consumer versions. Ethernet is a wired networking technology, thus does not employ radio waves at all. Understanding these characteristics highlights why Bluetooth is the predominant choice for short-range wireless communication.