A TDVL holder reaches 5 demerit points, then commits an offence carrying enough points to bring the total to 6 or more. What does LTA's enforcement explanation imply?

1. The vocational licence is at suspension risk once 6 or more points are accumulated
2. Nothing happens until 21 points exactly
3. Points apply only to PHC drivers, not taxi drivers
4. The points convert automatically into a course discount