Analyze the relationship between 'Sergio Marchionne' and 'Fiat' within the context of the input sentence.
Options: employer, product/material produced, parent organization, 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