In particular, they have leapt more than 80 percent since October, when CEO Sergio Marchionne announced plans to spin off Ferrari and give a big chunk of the highly-prized sports car maker's shares to Fiat Chrysler Automobiles (FCA) investors.
Take context from the input text and decide on the accurate relationship between 'Sergio Marchionne' and 'Fiat' from the options provided.
Options: employer, legal form, headquarters location, platform