Find the integral $\int(4\;e^{3x}+1)\;dx$

Question

$\begin{array}{1 1}\frac{4}{3}e^{3x}+x+c \\ \frac{4}{3}e^{2x}+x+c \\ \frac{3}{4}e^{3x}+x+c \\ \frac{3}{4}e^{4x}+x+c \end{array}$