Which among the following devices is also known as Visual Display Unit (VDU)?

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**Solution:**

1. A Visual Display Unit (VDU) is a device that displays output from a computer.

2. Among the options:
   - Printer is an output device but it prints on paper, not a display screen.
   - Scanner is an input device used to digitize documents.
   - Track Ball is an input device used for cursor control.
   - Monitor is an output device that visually displays images and text generated by the computer.

3. Therefore, the device also known as VDU is the **Monitor**.

**Answer:** Monitor

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