Which statement is correct about a spring tab ?

Question

Question ATPL - Airline Transport Pilot license - Principles of Flight

QuizVDS · Accepted Answer

At high IAS it behaves like a servo tab

QuizVDS · Answer

Its main purpose is to increase stick force per g

QuizVDS · Answer

At high IAS it behaves like a fixed extension of the elevator

QuizVDS · Answer

At low IAS it behaves like a servo tab

Id 389 - ATPL - Which statement is correct about a spring tab ?