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Tracker Ball: A Trackerball is an Input Device.A tracker ball is a pointing device; it is a mouse lying on its back. To move the pointer, you rotate the ball with your thumb, your fingers, or the palm of your hand. There are usually one to three buttons next to the ball, which you use just like mouse buttons.
This device is called a joystick. It was a very common gaming device in the early days of video games and computers, but has largely been replaced by other kinds of controllers.
Ergonomics is how comfortable a tool fits in the hand of the user. In the case of an Ergonomic Pen, the pen would have a good grip, and fit well in your hand. The concept can be applied to almost any tool such as: hammers, saws, game controlers, etc.
the answer choices are .. extension cord, power adapter, data cable, or telephone cord
You can say that, but now we've many hand held devices which is used to do or performs many tasks.