An infinitely long, straight wire lies along the \(y\)-axis and carries a constant current \(I_1\) in the \(+y\)-direction. A separate, straight wire segment of length \(L\) lies in the \(xy\)-plane along the \(x\)-axis from \(x = d\) to \(x = d + L\), where \(d > 0\), and carries a constant current \(I_2\) in the \(+x\)-direction. Which of the following diagrams best represents the direction and relative magnitude of the magnetic force per unit length, \(d\vec{F}/dx\), exerted on the horizontal wire segment by the magnetic field of the long wire?