What is the relationship between Carlos Tavares and Renault in the context of the input sentence. Choose an answer from: 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