code: def _determine_auto_detection_method():
          
  
          if dependencies.pytsk3.is_available:
              return 'pytsk3'
          elif dependencies.mmls.is_available:
              return 'mmls'
          elif dependencies.parted.is_available:
              return 'parted'
          else:
              raise PrerequisiteFailedError("No valid detection method is installed.")
docs: Return the detection method to use when the detection method is 'auto