A uniform \( \operatorname{rod} A B \) of length \( l \) and mass \( m \) is free to rotate abou...

A uniform \( \operatorname{rod} A B \) of length \( l \) and mass \( m \) is free to rotate about point \( A \). The rod is released from rest in horizontal position. Given that the moment of inertia of the rod about \( A \) is \( \frac{m l^{2}}{3} \) the initial angular acceleration of the rod will be
[CBSE PMT 2007; Similar NEET 2013]
(a) \( \frac{2 g}{3 l} \)
(b) \( \operatorname{mg} \frac{1}{2} \)
(c) \( \frac{3}{2} g l \)
(d) \( \frac{3 g}{2 l} \)