Under Article 175 of the Burundi Highway Code, what condition must a candidate satisfy before claiming a definitive Category C or Category D licence?

1. They must already have held a definitive Category B licence for at least two years
2. They must have driven at least 50,000 km on a provisional licence
3. They must have worked for a licensed transport company for five years
4. There is no prior condition; any adult may apply for Category C or D directly