Return random top level domain.

        :param tld_type: Enum object DomainType
        :return: Top level domain.
        :raises NonEnumerableError: if tld_type not in DomainType.

def top_level_domain(self, tld_type: Optional[TLDType] = None) -> str:
        """Return random top level domain.

        :param tld_type: Enum object DomainType
        :return: Top level domain.
        :raises NonEnumerableError: if tld_type not in DomainType.
        """
        key = self._validate_enum(item=tld_type, enum=TLDType)
        return self.random.choice(TLD[key])