Take context from the input text and decide on the accurate relationship between 'Sergio Marchionne' and 'Fiat' from the options provided.
Options: headquarters location, product/material produced, employer, parent organization

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