A PDVL holder wants to become licensed to drive a taxi. Which statement reflects LTA's current approach?

1. The holder can apply for PDVL-to-TDVL conversion and complete the conversion course and tests instead of the full direct TDVL course
2. The holder may drive a taxi immediately because PDVL and TDVL are identical
3. The holder must always restart with a learner driving licence
4. The holder only needs to buy a taxi roof sign