Take context from the input text and decide on the accurate relationship between 'classic' and 'General Motors' from the options provided.
Options: chief executive officer, director/manager, manufacturer, distribution format

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