Utilize the input text as a context reference, choose the right relationship between Bharti Airtel and Vodafone 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.

Upholding complaints against Bharti Airtel Ltd (Airtel) and Vodafone Essar Ltd (Vodafone), ASCI said the claimed advertisements were not adequately substantiated.

Answer: owned_by