What is the relationship between 'Ivan Glasenberg' and 'Glencore' in the context of the input sentence.
Options: chief executive officer, owned by, parent organization, owner of

LONDON—Collapsing commodity prices have forced one of the mining world’s most aggressive chief executives into retreat, pushing Glencore PLC’s Ivan Glasenberg on Monday to scrap the company’s dividend, issue more stock and sell assets.
owner of