Utilize the input text as a context reference, choose the right relationship between 'RATP' and 'public transport' from the options.
Options: parent organization, founded by, distributed by, industry

The leading private operator of public transport systems in Spain, Avanza won a bid for the contract in June over French rivals RATP and Transdev, Britain's National Express (LSE: NEX.L - news ) and Barraqueiro of Portugal.
industry