What is rigidity in space?

1. 1A spinning gyro stays fixed in the plane of its spin
2. 2A spinning gyro tilts at once when a force is applied to it
3. 3A spinning gyro turns with the aircraft around it
4. 4A spinning gyro loses speed when the vacuum falls

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 8: Flight Instruments — Gyroscopic Flight Instruments — Rigidity in Space, page 217