Utilize the input text as a context reference, choose the right relationship between Populous and architecture 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.

He told reporters earlier this year that the owners are working with the Kansas City-based Populous architecture firm on stadium plans.

Answer: industry