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

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