An input device is any hardware component that allows a user to enter data into a computer.
A scanner is an input device that converts physical documents into digital format.
The other options:
Printer is an output device.
Flash drive is a storage device.
CD can be both storage and media for input/output depending on the context but is not primarily used for direct data input.
Therefore, a scanner is the correct answer for an input device.
[References:, "Introduction to Computer Science" by ITL Education Solutions Limited, which discusses input and output devices., "Digital Fundamentals" by Thomas L. Floyd, which includes information on various peripherals., , , , ]
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