Final answer:
A customs declaration is what is typically completed an hour and thirty minutes prior to landing, required for international flights. Option 4 is correct.
Step-by-step explanation:
The task that is typically completed an hour and thirty minutes prior to landing is Option 4: Customs declaration. While a cabin safety check, passenger briefing, and beverage service are all important parts of flight preparation and procedures, the customs declaration is a specific requirement that passengers need to complete before landing in an international flight.
Airline staff usually distribute customs declaration forms to passengers before landing which need to be filled out with relevant information to present at the destination's customs and immigration.
Before an airplane lands, the cabin crew members perform a final safety check to ensure that everything is in order for the passengers during the landing process. They check emergency exits, seatbelts, and other safety procedures to make sure that the cabin is prepared for the landing.
It is essential to conduct these safety checks to ensure the safety and well-being of the passengers on board.