On the x-axis and at a distance x from the origin, the gravitational field due to a mass distribution is given by Ax/(x2 + a2)3/2 in the x-direction. The magnitude of gravitational potential on the x-axis at a distance x, taking its value to be zero at infinity, is
(1) A(x2 + a2)3/2
(2) A/(x2 + a2)3/2
(3) A/(x2 + a2)1/2
(4) A(x2 + a2)1/2