Concept:A computer device that can send data into the system, hold data for later use, and present or play back stored data performs all three roles.
Explanation:A USB flash drive is not only a portable storage device.
When inserted into a computer, it provides input by transferring saved files, such as documents or pictures, into the system.
It provides storage because it keeps these files safely on the drive even when it is removed from the computer.
It also provides output because the data stored on it can be opened, displayed, or viewed on the computer after being read from the drive.
The other options do not combine these three functions.
The CPU is mainly for processing, the keyboard is strictly an input device, and the monitor is strictly an output device.
Therefore, a USB flash drive is the best example of a device used for input, storage, and output in a computer system.
Answer:C. USB flash drive.