Input or output: What type of device is the following device?

Question

BlackTom AI · Accepted Answer

The question asks to classify the pictured device as input, output, or both. 
Option a: Input. The image shows a standard computer mouse, which is used to send user actions (like moves and clicks) to the computer. That makes it an input device. 
Option b: Output. An output device is something like a monitor or speaker that presents data from the computer to the user. A mouse does not display or play information, so this option is inaccurate.
Option c: Both input and output. Some devices can both send data to the computer and display data back to the user (like a touchscreen). A traditional mouse, however, does not provide output capabilities, so this option is incorrect for this device. 
In summary, the mouse functions to input user commands to the computer, while it does not produce output itself.

Input or output: What type of device is the following device?

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