An autonomous differential equation is defined by $\frac{dy}{dt} = g(y)$. If $g(y)$ has roots at $y_1 = -1$, $y_2 = 1$, and $y_3 = 2$, and the derivative $g'(y)$ satisfies $g'(-1) < 0$, $g'(1) > 0$, and $g'(2) < 0$, which of the following statements correctly identifies the stability of these equilibrium points?