Consider the following statements about Regional Organizations:

1. The European Union (EU) is both a political and economic union with a common currency for most member states.
2. ASEAN promotes economic and political cooperation among South Asian nations.
3. The African Union (AU) focuses on economic integration and conflict resolution across the African continent.
4. The Shanghai Cooperation Organisation (SCO) includes China, Russia, and Central Asian countries.

Which of the above statements are correct