In the following figure, if mass M is in equilibrium, then the ratio of m ₁ and m ₂ is (Neglect Earth's gravity and m ₁ and m ₂ are fixed)

(1) $\frac{3}{5}$                     (2) $\frac{4}{5}$               (3) $\frac{3}{4}$                  (4) $\frac{5}{4}$