For which of the following functions, the second order derivative is $2 e^2$?

$x^2\left(e^2+1\right)$ $x^2 e^2+2 x$ $x^2 e^4$ $\frac{e^4}{6}$

$x^2 e^2+2 x$

The correct answer is Option (2) → $x^2 e^2+2 x$