The de-linking of licences from spectrum wherein spectrum had to be bought in open auctions ensured that only serious operators remained in the game and led to a scenario where only three operators — Bharti Airtel , Vodafone India and Idea Cellular—consolidated their market position cornering around 75% of the subscriber market.
Take context from the input text and decide on the accurate relationship between 'Bharti Airtel' and 'Vodafone' from the options provided.
Options: manufacturer, owned by, parent organization, developer