In the context of the input sentence, determine the relationship between 'Bharti Airtel' and 'Vodafone'.
Options: distributed by, subsidiary, product/material produced, owned by

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