LONDON, July 21 (Reuters) - Vodafone said the bosses of its four biggest European markets would report directly to chief Vittorio Colao to speed up decision making in fast-changing markets, after it decided to scrap its European regional management structure.
In the context of the input sentence, determine the relationship between 'Vittorio Colao' and 'Vodafone'.
Options: employer, developer, platform, operator