What is the mandatory action regarding the vehicle license plates (chapas patentes) under Argentine traffic law?

1. Plates may be removed and placed on the dashboard if they are damaged
2. Both front and rear official plates must be clearly visible, clean, unobstructed, and securely attached in their designated factory positions
3. Only the rear license plate is legally required for private passenger cars
4. Drivers may apply tinted plastic covers over plates to protect them from dirt