Utilize the input text as a context reference, choose the right relationship between BMW Z4 and BMW 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 January this year, Transstroy signed three car loan agreements for Rs 4.73 crore with Alphera Financial Services, a financing arm of BMW Group Financial Services, to buy a Lamborghini Huracan coupe, a Mercedes Benz S350 and a BMW Z4 sDrive.

Answer: manufacturer