Final answer:
The courier must verify the cargo manifest and passenger list, maintain continuous communication with the aircraft crew, and follow standard airline passenger procedures when escorting classified bulk material on a commercial flight.
Step-by-step explanation:
When escorting classified bulk material aboard commercial passenger aircraft, a courier must undertake specific actions to ensure safety and security. The correct actions from the provided options would be:
Verify the cargo manifest and passenger list to ensure all items and individuals aboard are accounted for and authorized.
Maintain continuous communication with the aircraft crew to stay updated on any issues or changes in flight status that could affect the security of the classified material.
Follow all standard airline passenger procedures to blend in with the other passengers and not attract undue attention to the classified material.
It is important to note that keeping classified material in plain sight is not a recommended action as it may compromise the security of the materials. Classified materials should be handled discreetly and securely, in accordance with any prevailing regulations and procedures.