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Which statement best describes the third step of the CompTIA troubleshooting method?

  1. Document all activities and findings

  2. Verify the system is working and apply maintenance

  3. Test the established theory to determine the cause

  4. Plan and implement a solution to the problem

The correct answer is: Test the established theory to determine the cause

The third step of the CompTIA troubleshooting method involves testing the established theory to determine the cause of the problem. This means checking the hypothesis formed in the previous step and conducting relevant tests and experiments to either confirm or rule out the cause. Option A is incorrect because documenting activities and findings typically occurs in the first step, while option B is incorrect because verifying the system and applying maintenance is typically done after the cause has been determined. Option D is incorrect because planning and implementing a solution is usually the final step of the troubleshooting process.