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Fall protection must be used at heights of:

  1. 10' or more

  2. 8' or more

  3. 6' or more

  4. Any height

The correct answer is: 10' or more

Fall protection must be used at heights of 10 feet or higher because this is the standard set by the Occupational Safety and Health Administration (OSHA) to prevent falls and protect workers' safety. The other options, 8 feet, 6 feet, and any height, are incorrect because they do not meet the minimum height requirement for fall protection according to OSHA regulations. While fall prevention should always be a priority, it becomes even more crucial at heights of 10 feet or more due to the increased risk of serious injuries or fatalities in the event of a fall.