All four are true, technically.
But the right answer is probably the third one.
Explanation:
If a device is putting data into the computer in the form of text, sound, images, button presses etc. then it is an input device, if the device is outputting things from the computer such as sound, movement, printing, images etc., then it is an output device. ... Therefore it is an input device.
i believe some are google docs, apple icloud, xdrive, MediaMax, and Strongspace