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

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