What action has no effect on the rotor RPM in an autorotation?

Question

Question PPL(H) - Private Pilot License - Principles of Flight (Helicopter)

QuizVDS · Accepted Answer

Utilisation of friction brake.

QuizVDS · Answer

Centre of gravity displacement.

QuizVDS · Answer

Pitch angle change.

QuizVDS · Answer

Transition into a turning flight.

Id 716 - PPL(H) EN - What action has no effect on the rotor RPM in an autorotation?