What is the function of the 'Overrunning Clutch' (one-way clutch) in the stator assembly of a torque converter?

1. To allow the stator to rotate freely in one direction but lock in the opposite direction
2. To connect the turbine directly to the impeller during high-speed cruising
3. To prevent the transmission fluid from flowing backward into the pump
4. To allow the converter to slip when the vehicle is stopped in gear