Utilize the input text as a context reference, choose the right relationship between Daimler and Daimler AG 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.

Daimler Trucks North America, a unit of Germany’s Daimler AG DAI, +0.34% unveiled the SuperTruck earlier this year, part of a program sponsored by the Department of Energy that tasked truck-makers to improve freight efficiency and reduce emissions from big rigs — the kind that carry 70% of the freight shipped on U.S. roads.

Answer: parent_organization