A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3 rpm. The torque required to stop after $2\pi$ revolutions is :

Question

( A ) $2\times10^{-3}Nm$
( B ) $2\times10^{-6}Nm$
( C ) $2\times10^{6}Nm$
( D ) $12\times10^{-4}Nm$