Write the next sentence in the following story.

How to save energy automatically with your computers
Use energy-efficient computer models.
Some computers have been manufactured and tested specifically to ensure that they consume less energy.
Verify that your computers have an energy star logo or other government-supported logo, which indicates that the computers save costs on energy bills and are designed to help reduce pollutants that are harmful to the environment.

Pick from:
[1]. Download and install a new operating system. If you're simply content programming for fun, but very intelligent, you'll need a system that is compatible with faster computer systems..
[2]. If the logo does not include this logo or identifying features, then your computer model may be defective or unusable. Look for a lower spf versus b12 rating..
[3]. Use laptop computers instead of desktop computers. The majority of laptops only burn between 15 and 60 watts when in use; whereas desktop computers burn between 70 and 200 watts when in use..
[4]. Verify that your batteries are compatible with computers with live, static electricity. Check if your computer has live cable and connections, which contribute to energy costs... The answer should be
[3].