code: def get_period_options(self):
          
  
          if self.report_period_type == 'ago':
              return PERIOD_AGO_LOOKUPS
          elif self.report_period_type == 'current':
              return PERIOD_CURRENT_LOOKUPS
          elif self.report_period_type == 'both':
              return PERIOD_AGO_LOOKUPS + PERIOD_CURRENT_LOOKUPS
          else:
              raise ValueError("Invalid report period type. Expected: 'ago', 'current', or 'both'")
docs: Given the current setting in report_period_type, returns a list of options (suitable for select)
            as an array or pairs telling the valid periods to select.
          :return: An array of period options.