Take context from the input text and decide on the accurate relationship between 'Vittorio Colao' and 'Vodafone' from the options provided.
Options: original broadcaster, employer, owned by, chief executive officer

Vodafone chief executive Vittorio Colao has promoted the leaders of the company’s biggest European markets to his top table, even as the networks they run are at the centre of talks about a potential combination with Liberty Global (NasdaqGS: LBTYA - news ) .
employer