Utilize the input text as a context reference, choose the right relationship between Tigo and Millicom 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.

Millicom University, which launched in 2014, will connect Tigo employees to more than 20,000 online courses from first rate academic entities such as Harvard.

Answer: parent_organization