Analyze the relationship between 'Glencore' and 'Ivan Glasenberg' within the context of the input sentence.
Options: chief executive officer, legal form, operator, distributed by

Billionaire fortune all in where you count The good news is that despite losing around half a billion US dollars in a day, Glencore boss "Aussie" Ivan Glasenberg is still a billionaire in the currencies of all the various countries that claim him as a citizen.
chief executive officer