Take context from the input text and decide on the accurate relationship between 'Buick' and 'General Motors' from the options provided.
Options: member of, employer, legal form, parent organization

The sub-compact Buick Encore crossover, which is currently imported from Korea, is also expected to be produced in China soon.However, General Motors will continue with the production of two of Buick's future U.S. models in North America, namely the mid-sized LaCrosse sedan and the large Enclave crossover.
parent organization