Refer to the input text as context and select the correct relationship between 'Vittorio Colao' and 'Vodafone' from the available options.
Options: employer, owned by, chief executive officer, original broadcaster

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