In the context of the input sentence, determine the relationship between 'Diageo' and 'Smirnoff'.
Options: owned by, position held, owner of, 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