Which statement about a primary control surface controlled by a servo tab, is correct? - ATPL

Question id 92 - Principles of Flight - ATPL - Airline Transport Pilot license

The position is undetermined during taxiing, in particular with tailwind

Due to the effectiveness of the servo tab the control surface area can be smaller

The control effectiveness of the primary surface is increased by servo tab deflection

The servo tab can also be used as a balance tab