A rod `PQ` of mass `M` and length `L` is hinged at end `P`. The rod is kept horizontal by a massless string tied to point `Q` as shown in the figure. When string is cut, the initial angular accleration of the rod is.
A. `(3g)/(2L)`
B. `(g)/(L)`
C. `(2g)/(L)`
D. `(2g)/(3L)`