What is the crucial legal difference between a 'No Parking' sign (red circular border, blue background, red 'X') and a 'No Long-Term Parking' sign (red circular border, blue background, single red diagonal slash '/') under GB 5768?

1. The 'X' sign strictly prohibits all stopping and parking; the single slash sign allows temporary stopping (such as loading/unloading or passengers boarding) provided the driver remains in the vehicle
2. The 'X' sign applies to passenger cars only; the single slash sign applies to heavy trucks only
3. The 'X' sign applies only at night; the single slash sign applies during daytime
4. There is no legal difference; both signs carry identical fines and point deductions