Answer: A. Printer, B. Monitor, C. Plotter.
Answer analysis:
When answering this question about output devices, we need to first clarify what output devices are. Output devices are part of computer hardware, which are used to display the data processed by the computer in some form, such as visual, auditory or tactile forms. Now, let's analyze the given options one by one:
A. Printer: The printer is a typical output device that can print text, images and other information in the computer on paper for people to read or save.
B. Monitor: The monitor is also a kind of output device. It can intuitively display the information in the computer in the form of images, text, etc. on the screen for users to watch.
C. Plotter: The plotter is a precision graphic output device, usually used to draw high-quality graphics or engineering drawings. It draws precise graphics based on the instructions and data in the computer, so it is also an output device.
D. Keyboard: The keyboard is not an output device, but an input device. It allows users to input data and instructions to the computer by pressing keys.
In summary, the options that belong to output devices are A (printer), B (monitor) and C (plotter). D (keyboard) is an input device and is not an output device.
Therefore, the correct answer is A, B, C.