A thin, straight wire carrying a steady current \(I\) in the \(+x\)-direction lies along the \(x\)-axis from \(x = -L\) to \(x = +2L\). An observation point \(P\) is located on the \(y\)-axis at \((0, d, 0)\), where \(d > 0\). Which of the following expressions correctly represents the integral setup for the net magnetic field vector \(\vec{B}\) at point \(P\) in terms of the given quantities, the unit vector \(\hat{k}\) pointing out of the page in the \(+z\)-direction, and fundamental constants?