Analyze the relationship between 'Sergio Marchionne' and 'Fiat' within the context of the input sentence.
Options: distributed by, headquarters location, employer, member of

Sergio Marchionne had a funny thing to say about the $32,500 battery-powered Fiat 500e that his company markets in California as “eco-chic.” “I hope you don’t buy it,” he told his audience at a think tank in Washington in May 2014.
employer