What is the relationship between Maersk and COPENHAGEN in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

COPENHAGEN Aug 31 Maersk Oil has received approval by the UK's Oil & Gas Authority to develop the largest gas field discovered in the UK North Sea in more than a decade, the Danish oil company said on Monday.

Answer: headquarters_location