Two circular discs of radius each 10 cm are joined at their centres by a rod of length 30 cm and mass 600 gm as shown in figure.
If the mass of each disc is 600 gm and applied torque between two discs is $$43\times 10^{5} dyne.cm$$. the angular acceleration of the discs about the given axis AB is_______$$rad/s^{2}$$.

A

27

B

11

C

22

D

100