What is the relationship between Vodafone and ONO in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.
Text: Vodafone bought phone and Internet provider ONO for 7.2 billion euros ($8.0 billion) last year and has been integrating ONO's cable network into its own wireless services.
user
subsidiary
assistant