Two point charges each of charge Q are placed at points P(–a, 0) and Q(a, 0). Which of the following represents variation of electric field with distance along x-axis?

Net electric field for x $< -a points in the left andis considered negative, for -a<x net electric field points to the right and is considered positive, for 0<x<a, net electric field points to the left and is negative, for x>a the net electric field points in the right and is positive .$