code: def validate_seeded_answers_simple(answers, options, algo):
      
      seen_options = {}
      for answer in answers:
          if answer:
              key = options[answer['answer']].get('text')
              if options[answer['answer']].get('image_url'):
                  key += options[answer['answer']].get('image_url')
              seen_options.setdefault(key, 0)
              seen_options[key] += 1
  
      missing_options = []
      index = 1
      for option in options:
          key = option.get('text') + option.get('image_url') if option.get('image_url') else option.get('text')
          if option.get('text') != 'n/a':
              if seen_options.get(key, 0) == 0:
                  missing_options.append(_('Option ') + str(index))
              index += 1
  
      if missing_options:
          return {'seed_error': _('Missing option seed(s): ') + ', '.join(missing_options)}
  
      return None
docs: This validator checks if the answers includes all possible options
  
      Args:
          answers (str): the answers to be checked
          options (dict): all options that should exist in the answers
          algo (str): selection algorithm
  
      Returns:
          None if everything is good. Otherwise, the missing option error message.