What is the purpose of the 'Damper Springs' (torsional springs) built into the center hub of a clutch friction disc?

1. To absorb torsional shock and vibration when the clutch is engaged
2. To push the pressure plate away from the disc when releasing the pedal
3. To hold the friction linings securely to the steel cushion segments
4. To adjust the height of the diaphragm spring fingers automatically