Analyze the relationship between 'Noble Group' and 'energy' within the context of the input sentence.
Options: director/manager, product/material produced, distributed by, headquarters location

LONDON—Commodities trading giant Noble Group Ltd is winding down its exposure to some metals and focusing on what it says is a profitable energy business as it addresses the global resources rout that has made the Singapore-listed firm a big focus for investors looking for casualties amid the carnage.
product/material produced