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

Airtel M Commerce Services Ltd, a unit of Bharti Airtel - the world's third-largest telecom company by number of subscribers - is among 41 applicants, including the likes of Reliance Industries, Aditya Birla Group, Tech Mahindra, Vodafone and Videocon, who are seeking payment bank licences.
owned by