Question id 31 - Performance - ATPL - Airline Transport Pilot license

Is the airspeed on the ground at which the pilot is assumed to have made a decision to continue or discontinue the take-off.
Is the airspeed of the aeroplane upon reaching 35 feet above the take-off surface.
Is an airspeed at which the aeroplane is airborne but below 35 ft and the pilot is assumed to have made a decision to continue or discontinue the take-off .
Is always equal to VEF (Engine Failure speed).