Utilize the input text as a context reference, choose the right relationship between 'Sergio Marchionne' and 'Fiat' from the options.
Options: publisher, employer, distribution format, director/manager

DETROIT (AP) - Fiat Chrysler CEO Sergio Marchionne has canceled plans Tuesday to attend the Frankfurt International Motor Show in Germany, an indication that the company may be getting close to a contract agreement with the United Auto Workers union.
employer