The potential at a point $x$ (measured in $\mu m$) due to some charges situated on the $x$-axis is given by : $V(x) = 20/(x^2 - 4)$ volt <br> The electric field $E$ at $x=4 \mu m$ is given by :

Question

( A ) $\frac{10}{9} V/ \mu m$ and in the -ve $x$ direction
( B ) $\frac{10}{9} V/ \mu m$ and in the +ve $x$ direction
( C ) $\frac{5}{3} V/ \mu m$ and in the +ve $x$ direction
( D ) $\frac{5}{3} V/ \mu m$ and in the -ve $x$ direction