The correct answer is D. Cut off the power supply.
To shut down your computer, you should first save all opened files and close all running applications. Then, you can switch off the monitor. Finally, you can cut off the power supply. However, cutting off the power supply without first saving your files and closing your applications can cause data loss and damage to your computer.
Here is a more detailed explanation of each option:
- A. Save all opened files: This is essential to avoid losing any unsaved work.
- B. Close all running applications: This is important to prevent any applications from crashing or causing problems when you shut down your computer.
- C. Switch off monitor: This is not essential, but it can help to save energy and reduce wear and tear on your monitor.
- D. Cut off the power supply: This is not essential, but it can be helpful if you need to shut down your computer quickly or if there is a power outage.
It is important to note that cutting off the power supply without first saving your files and closing your applications can cause data loss and damage to your computer. Therefore, it is always best to follow the steps above to safely shut down your computer.