Along a segment of the \(x\)-axis, a fixed charge distribution creates an electric potential given by \(V(x) = V_0 + b x^2\), where \(V_0\) and \(b\) are positive constants. A small particle with mass \(m\) and positive charge \(q\) is released from rest at \(x = x_0\), where \(x_0\) is small. Which of the following expressions represents the angular frequency \(\omega\) of the particle's small oscillations about \(x = 0\)?