Final answer:
Transporting dangerous goods in crew baggage is not allowed; it is allowed as cargo only.
Step-by-step explanation:
The correct answer is a. Transportation as crew baggage is not allowed; it is allowed as cargo only. According to the ICAO/IATA Dangerous Goods Regulations (DGR), dangerous goods cannot be transported in crew baggage. Crew members are not subject to the IATA dangerous goods regulations when it comes to transporting dangerous goods. The transportation of dangerous goods must be done as cargo and abide by the necessary labels and documentation.