Final answer:
The mandatory items that must be available on an aircraft typically include the Flight Authority, Flight Manual, Markings and Placards, as well as the MEL or MMEL. Therefore, option A is the correct answer.
Step-by-step explanation:
The question pertains to the mandatory items that must be present on an aircraft according to aviation regulations. From the options given, the correct answer aligns closely with international aviation standards, which often require the following to be on board:
- Flight Authority
- Flight Manual
- Markings and placards
- Journey Logbook
- Minimum Equipment List (MEL), which sometimes references the Master Minimum Equipment List (MMEL)
Thus, option A is the correct one. It's worth noting that while some items listed in the other options are also commonly required, option A includes the fundamental elements that pertain directly to the operation and airworthiness of the aircraft. The Flight Authority represents the certification that the aircraft is fit for flight, the Flight Manual contains all necessary operational information for the aircraft, and the MEL helps the crew determine if the aircraft can legally take off with inoperative equipment.