What is required to board passengers on an aircraft?

For boarding passengers on an aircraft, having the minimum number of flight attendants is essential. This requirement ensures that there are sufficient trained crew members to assist passengers during the boarding process and to carry out safety demonstrations effectively. Adequate flight attendant staffing helps manage passengers, ensures compliance with safety regulations, and enhances overall safety and service levels in the aircraft cabin.

A captain's approval is certainly important for many processes related to flight operations, but it does not specifically address boarding requirements. Landing clearance is associated with the landing phase of a flight rather than the boarding process, and passenger identification, while important for security measures, is not directly related to the operational requirements for boarding. Thus, having the minimum number of flight attendants is the correct response concerning the operational readiness for boarding passengers.