code: def _ParseVSSProcessingOptions(self, options):
      
      vss_only = False
      vss_stores = None
  
      self._process_vss = not getattr(options, 'no_vss', False)
      if self._process_vss:
        vss_only = getattr(options, 'vss_only', False)
        vss_stores = getattr(options, 'vss_stores', None)
  
      if vss_stores:
        try:
          self._ParseVolumeIdentifiersString(vss_stores, prefix='vss')
        except ValueError:
          raise errors.BadConfigOption('Unsupported VSS stores')
  
      self._vss_only = vss_only
      self._vss_stores = vss_stores
docs: Parses the VSS processing options.
  
      Args:
        options (argparse.Namespace): command line arguments.
  
      Raises:
        BadConfigOption: if the options are invalid.