Utilize the input text as a context reference, choose the right relationship between Mary Barra and General Motors 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.

DETROIT, July 13 General Motors Co Chief Executive Mary Barra said Monday the automaker has "no plans to change" its strategy of building the Chevrolet Sonic small car in the U.S.

Answer: employer