If a ladder is not in balance against a smooth vertical wall, then it can be made in balance by :

Question

$\begin{array}{1 1} (1)\; \text{Decreasing the length of ladder} \\ (2)\; \text{Increasing the length of ladder} \\ (3)\; \text{Increasing the angle of inclination} \\ (4)\; \text{Decreasing the angle of inclination} \end{array}$