How do Smart Tachographs Gen2 detect motion sensor tampering or GPS spoofing attempts under EU security specifications?

1. By cross-checking the encrypted motion sensor signal from the gearbox against GNSS-derived velocity and an independent vehicle speed signal, logging any inconsistency as a security event
2. By sending a text message to the driver's mobile telephone
3. By comparing recorded distance with the odometer reading at the next periodic inspection
4. By requiring the driver to confirm the vehicle position manually at every stop