The eccentricity of an ellipse whose centre is at the origin is $\frac{1}{2}$. If one of its directrices is $x = -4$, then the equation of the normal to it at $\left(1, \frac{3}{2}\right)$ is:\\
(1) $4x - 2y = 1$\\
(2) $4x + 2y = 7$\\
(3) $x + 2y = 4$\\
(4) $2y - x = 2$