Take context from the input text and decide on the accurate relationship between 'EU' and 'European Union' from the options provided.
Options: chief executive officer, brand, operator, creator

\r The Greek Referendum Outcomes Explained in One Chart \r What it’s Like to be a Stock Broker in Greece \r EU Doubts The creditor institutions still view the July 5 referendum as a potential barrier to agreement, according to a European Union official.
operator