A thin, rigid wire carrying a constant current \(I\) lies in the xy-plane and is bent into a right angle at the origin. One semi-infinite segment extends along the positive x-axis from \(x = 0\) to \(x = +\infty\) with current flowing away from the origin. A second semi-infinite segment extends along the negative y-axis from \(y = -\infty\) to \(y = 0\) with current flowing toward the origin. Point \(P\) is located on the positive y-axis at coordinates \((0, d)\). Which of the following expressions represents the magnitude of the net magnetic field at point \(P\)?