Utilize the input text as a context reference, choose the right relationship between Nord Pool and Oslo 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.

I'll answer on the Nord Pool strategy and Giorgio will answer on the Oslo Børs cash equity yield.

Answer: headquarters_location