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.
Refer to the input text as context and select the correct relationship between 'Ivan Glasenberg' and 'Glencore' from the available options.
Options: brand, owner of, business division, publisher