What is the relationship between 'EU' and 'European Union' in the context of the input sentence.
Options: business division, director/manager, operator, platform

A “Grexit” (Greek Exit) could influence PIIGS nations to leave the Eurozone, Great Britain’s upcoming referendum to exit (“Brexit”) the European Union (EU), and France’s potential exit (“Frexit”) from both the Euro and EU if Marine LePen’s nationalists come to power.
operator