A uniform rod of mass 20 kg and length 1.6 m is pivoted at its end and swings in the vertical plane. Angular acceleration of the rod just after the rod is released from rest in the horizontal position

Question

$$\begin {array} {1 1} (a)\;\frac{15g}{16} & \quad (b)\;\frac{17\;g}{16} \\ (c)\;\frac{16\;g}{15} & \quad  (d)\;\frac{g}{15} \end {array}$$