Utilize the input text as a context reference, choose the right relationship between Maersk and COPENHAGEN from the options. Options: 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: location_of_formation