What is the relationship between 'Mary Barra' and 'General Motors' in the context of the input sentence.
Options: employer, distributed by, chairperson, publisher

General Motors Co. GM -1.07 % Chief Executive Mary Barra said earlier this week she sees no need to follow Ford’s move because she is confident the company can profitably build its small cars in the U.S. GM builds its Chevy Sonic subcompact and Cruze compact in the Midwest.
employer