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.
Text: DETROIT (Reuters) - General Motors Co (GM.N) Chief Executive Mary Barra said the automaker plans new efforts to capitalise on the connectivity built into its cars, expanding car sharing services, offering more autonomous driving features and enabling services through smartphone apps.
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