An experiment is designed to determine the angular frequency \(\omega\) of a horizontal oscillator consisting of a block of mass \(M\) attached to a spring of force constant \(k\), length \(L\), and uniform mass \(m_s\). The block is released from rest from various displacement amplitudes \(A\) along a frictionless horizontal track, and its maximum speed \(v_{\text{max}}\) is recorded for each trial. Each element of the spring at a distance \(x\) from its fixed end moves with speed \(v(x) = \left(\dfrac{x}{L}\right)v\), where \(v\) is the instantaneous speed of the block. If the student plots \(v_{\text{max}}\) on the vertical axis as a function of \(A\) on the horizontal axis, which of the following correctly identifies the theoretical slope of the best-fit line and the effect of the spring's mass on the graph compared to that of an ideal massless spring?