Utilize the input text as a context reference, choose the right relationship between 'Sergio Marchionne' and 'Fiat' from the options.
Options: creator, brand, employer, headquarters location

FRANKFURT (Reuters) - Fiat plans to keep all German Opel plants open should its takeover plans for the General Motors unit succeed but would cut staff there, Fiat Chief Executive Sergio Marchionne told a newspaper.
employer