2. Two small balls, each of mass 1 kg, move in opposite directions with velocities of 4 m/s and collide elastically. If they collide off-center, causing one ball to spin post-collision, what is the angular momentum of the system about the point of the collision? (A) 0 kg-m²/s (B) 1 kg-m²/s (C) 2 kg-m²/s (D) 4 kg-m²/s (E) 8 kg-m²/s