Under what condition is fissile material exempt from the full CSI package classification rules under ADR 2.2.7.2.3.5?

1. Whenever the fissile material is dissolved in orange juice
2. Whenever the driver holds a master's degree in physics
3. Whenever transport occurs on a leap year
4. If the total mass of fissile nuclides per package does not exceed specific small quantity limits (e.g. 2 grams of U-235) or meets specific dilution criteria