Utilize the input text as a context reference, choose the right relationship between Bing and Microsoft 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 the past month, Microsoft has sold some of its Bing maps tech (and employees) to Uber, and also struck a partnership with (Engadget's parent company) AOL to essentially hand off its display ad business .

Answer: operator