Analyze the relationship between 'Carlos Ghosn' and 'Nissan' within the context of the input sentence.
Options: currency, position held, owned by, employer

However last week’s announcement saw claims that chief executive Carlos Ghosn had been "scaremongering" when he warned that the prospect of Britain leaving the EU or renegotiating its membership terms would cause Nissan to “reconsider” its investments in the UK.
employer