An L-shaped rod ABC rotates freely in the vertical plane about the pin at point A. At this moment, a constant 180 N-m counterclockwise couple acts on the rod. The angular velocity of the rod is currently 2 rad/s. Which of the following options correctly represents the effect of this situation?

A) The angular acceleration of the rod is 90 rad/s² in the clockwise direction.
B) The angular acceleration of the rod is 90 rad/s² in the counterclockwise direction.
C) The angular acceleration of the rod is 45 rad/s² in the clockwise direction.
D) The angular acceleration of the rod is 45 rad/s² in the counterclockwise direction.