Which of the following is an output device connected to a computer?

The correct choice is a plotter, which is indeed an output device connected to a computer. A plotter produces high-quality graphics and prints that can be used for technical drawings, architectural plans, or large-scale designs. It works by moving a pen across the surface of paper to create precise, detailed lines and curves, making it an essential tool in fields like engineering and graphic design where detail and accuracy are critical.

In understanding the other options, a printer is also an output device commonly used to generate hard copies of documents or images, while a monitor displays visual output from the computer, showing everything from user interfaces to videos. A scanner, on the other hand, serves as an input device that captures images or text and converts them into a digital format that can be stored on a computer. While both the printer and monitor are output devices, and the scanner is an input device, the plotter stands out in its specific function for producing detailed graphical output.