Utilize the input text as a context reference, choose the right relationship between RATP and public transport from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

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.

Answer: industry