Utilize the input text as a context reference, choose the right relationship between Delhaize and retail 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.

In June, we expanded our partnership with Ahold Delhaize USA and Peapod Digital Labs, to power a self-service platform across their U.S. retail banners for sponsored product search advertising.

Answer: industry