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