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

A

$$2 \times 10^{-3} N m$$

B

$$12 \times 10^{-4} N m$$

C

$$2 \times 10^{6} N m$$

D

$$2 \times 10^{-6} N m$$