A research elevator cab ascends along a vertical axis where the positive y-direction is defined as upward. Inside the cab, two identical blocks of mass m are monitored: Block 1 is suspended from an ideal spring scale attached to the ceiling, and Block 2 rests on an ideal platform scale fixed to the floor. The vertical position of the cab as a function of time is given by \(y(t) = b t^2 - c t^3\), where b and c are positive constants such that \(b < g\). At time \(t_1 = \dfrac{b}{2c}\), which of the following correctly compares the scale readings \(F_{\text{spring}}\) and \(F_{\text{platform}}\) to the true gravitational weight mg, and indicates the direction of the blocks' instantaneous acceleration vector \(\vec{a}\)?