A thin rectangular conducting strip of width \(w\) and thickness \(d\) carries a uniform current \(I\) in the \(+x\)-direction. A uniform magnetic field \(\vec{B} = B_0 \hat{k}\) is directed perpendicular to the strip in the \(+z\)-direction. Due to the magnetic force on the charge carriers (each having charge magnitude \(q\)), a steady-state Hall potential difference \(V_H\) is established across the width \(w\) of the strip. Which of the following expressions is a correct expression for the volume charge carrier density \(n\) of the strip?