code: def create_dhcp_options(self, vpc_id, cidr_block, availability_zone=None):
          
          params = {'VpcId' : vpc_id,
                    'CidrBlock' : cidr_block}
          if availability_zone:
              params['AvailabilityZone'] = availability_zone
          return self.get_object('CreateDhcpOption', params, DhcpOptions)
docs: Create a new DhcpOption
  
          :type vpc_id: str
          :param vpc_id: The ID of the VPC where you want to create the subnet.
  
          :type cidr_block: str
          :param cidr_block: The CIDR block you want the subnet to cover.
  
          :type availability_zone: str
          :param availability_zone: The AZ you want the subnet in
  
          :rtype: The newly created DhcpOption
          :return: A :class:`boto.vpc.customergateway.DhcpOption` object