Utilize the input text as a context reference, choose the right relationship between Carlos Tavares and Renault from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

The tussle pits Peugeot Chief Executive Carlos Tavares against his former boss, Renault CEO Carlos Ghosn, for the main prize - a major manufacturing deal with Iran Khodro.

Answer: employer