He argues that investors are not only sending a message to Glencore chief executive Ivan Glasenberg about the need for a less leveraged balance sheet, they are also sending a message to BHP Billiton and Rio Tinto about their unsustainable dividend policies.
Utilize the input text as a context reference, choose the right relationship between 'Ivan Glasenberg' and 'Glencore' from the options.
Options: brand, business division, owner of, publisher