Refer to the input text as context and select the correct relationship between 'Bolloré' and 'Vivendi' from the available options.
Options: owner of, position held, employer, platform

PARIS—French billionaire and Vivendi SA chairman Vincent Bolloré ousted the longtime chief of Canal Plus on Thursday, further tightening his grip over the Vivendi-owned pay-TV group amid falling subscriber numbers.
owner of