A Point Charge + Q Is Located on the X-Axis

Multiple Choice

A point charge + Q is located on the x-axis at x = a,and a second point charge -Q is located on the x axis at x = -a.A cubic Gaussian surface with sides l = 3a is centered at the origin.The flux through this Gaussian surface is

A) zero.
B) greater than zero.
C) less than zero.
D) None are correct.