In the context of the input sentence, determine the relationship between 'Sergio Marchionne' and 'Fiat'.
Options: distributed by, founded by, employer, parent organization

While many votes are yet to be cast, the lukewarm initial reception raises the possibility that UAW officials may need to revisit the bargaining table with Fiat Chrysler Chief Executive Sergio Marchionne , or move on to Ford Motor F -3.03 % Co. or General Motors Co. GM -2.89 % and return to Fiat Chrysler later.
employer