Franco Zeffirelli, KBE Grande Ufficiale OMRI (] ; born 12 February 1923) is an Italian director and producer of operas, films and television. He is also a former senator (1994–2001) for the Italian centre-right "Forza Italia" party. Recently, Italian researchers have found that he is one of the few distant relatives of Leonardo da Vinci. Using only the above description and what you know about the world, "Franco Zeffirelli served as a senator for 7 years" is definitely correct, incorrect, or inconclusive? 