Take context from the input text and decide on the accurate relationship between 'Bharti Airtel' and 'Vodafone' from the options provided.
Options: owned by, distributed by, subsidiary, product/material produced

Jio won 4G mobile airwaves in 2010 and is expected to start nationwide commercial services by end of this year, joining leading Indian carriers Bharti Airtel Ltd and Vodafone Group Plc's India unit.
owned by