What is the relationship between 'classic' and 'General Motors' in the context of the input sentence.
Options: distribution format, director/manager, chief executive officer, manufacturer

The automaker says that Post to Facebook GM, Kettering converting famous factory to car museum DETROIT -- General Motors and Kettering University will convert a historic car factory in Flint, Mich., into an archive and research center that will house a collection of classic cars.
manufacturer