In the context of the input sentence, determine the relationship between 'Sergio Marchionne' and 'Fiat'.
Options: position held, legal form, creator, employer

Franz told Reuters that Fiat Chief Executive Sergio Marchionne had said at a meeting on Monday he foresaw closing Opel's Kaiserslautern engine plant in Germany and other Fiat and Opel manufacturing sites in England and Italy.
employer