A student conducts an experiment to determine the unknown net charge \(Q\) distributed uniformly throughout an isolated sphere of radius \(R_0\). Using a field probe, the student measures the electric field magnitude \(E\) at multiple radial distances \(r\) from the center of the sphere, where all data points are taken in the region \(r > R_0\). Which of the following identifies the quantities that should be plotted on the vertical and horizontal axes to yield a linear graph, along with the correct relationship to calculate \(Q\) from the slope \(m\) of the line of best fit?