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 ) .
In the context of the input sentence, determine the relationship between 'Vittorio Colao' and 'Vodafone'.
Options: original broadcaster, employer, owned by, chief executive officer