What is the relationship between 'Diageo' and 'Smirnoff' in the context of the input sentence.
Options: owner of, position held, owned by, subsidiary

The Smirnoff vodka maker will buy out the Dutch brewer’s stake in Brandhouse, a sales and marketing entity, while Heineken will focus on beer, ending a joint venture with Diageo that began in 2004 to sell spirits, beer and cider in Africa.
owner of