SAT Math Question of the Day

Q: 2ⁿ + 2ⁿ = ?

1. 2^{(n + 1)}
2. 2⁽ⁿ²⁾
3. 2⁽²ⁿ⁾
4. 4⁽²ⁿ⁾
5. 4^{(n n)}