Take context from the input text and decide on the accurate relationship between 'Carlos Ghosn' and 'Nissan' from the options provided.
Options: employer, member of, owned by, chief executive officer

NEW YORK, Sept 22 Nissan Motor Co CEO Carlos Ghosn said it would be difficult for an automaker to conceal internally an effort to falsify vehicle emissions data, such as has happened at Volkswagen AG.
employer