def options(self, context, module_options):
        """
        DOMAIN  Domain to enumerate DNS for. Defaults to all zones.
        """
        self.domains = None
        if module_options and "DOMAIN" in module_options:
            self.domains = module_options["DOMAIN"]

        DOMAIN  Domain to enumerate DNS for. Defaults to all zones.
        
cme/modules/enum_dns.py