We know that 2\(^n\) = y.
Therefore, 2\(^{(2 + \frac{n}{3})}\) can be written as 2\(^2\) × 2\(^{\frac{n}{3}}\) = 4 × 2\(^{\frac{n}{3}}\).
Substituting 2\(^n\) = y in the above equation, we get:
2\(^{(2 + \frac{n}{3})}\) = 4y\(^\frac{1}{3}\)
Therefore, the answer is (a) 4y\(^\frac{1}{3}\).