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.
Utilize the input text as a context reference, choose the right relationship between 'Bharti Airtel' and 'Vodafone' from the options.
Options: product/material produced, owned by, distributed by, subsidiary