Which of the following computer devices are output devices only? Choose the correct answer from the options given below.

A CRT monitor and a plotter are output-only devices, since both display or draw results without taking input.

A CRT monitor shows the computer's visual output on a screen.

A plotter draws precise line graphics such as maps and engineering plans on paper.

A track ball is an input device that moves the pointer by rolling a ball.

A number pad is an input device used to type digits into the computer.

Output devices present data to the user, while input devices feed data to the computer.