Under Article 53(g) of Ley 24.449, which vehicles must be equipped with a tamper-proof, easy-to-read control device (tachograph) recording speed, distance, time and other driving-behavior variables?

1. Only vehicles older than 20 years
2. Passenger and cargo transport service vehicles, except those assigned to urban transport
3. Only vehicles transporting hazardous materials
4. No vehicles; tachographs are optional comfort accessories