What is the relationship between 'Sergio Marchionne' and 'Fiat' in the context of the input sentence.
Options: parent organization, product/material produced, employer, headquarters location

Italy's transport ministry will publish new car registration figures for June later in the day, and Fiat Chief Executive Sergio Marchionne previously said they would be just as "disastrous" as the previous month, when they fell 17.6 percent.
employer