Take context from the input text and decide on the accurate relationship between 'Mary Barra' and 'General Motors' from the options provided.
Options: currency, business division, employer, manufacturer

Share on Facebook Share on Twitter Share on WhatsApp Share on LinkedIn Share on Reddit Share on Google+ E-mail Share on Twitter Share on WhatsApp About a year ago, Mary Barra gathered General Motors Co.’s top 300 executives at the company’s test track west of Detroit.
employer