Which among the following statements about European Union (EU) are correct?
1. The EU is the world's largest economy.
2. The EU has its own flag, anthem and currency
3. The EU's combined armed forces are the second largest in the world.
4. The EU has its own Constitution.
Select the correct answer using the code given below:

Options

A. 1, 2 and 3
B. 1 and 4
C. 2 and 3 only
D. 3 and 4