How many crew life vests are onboard the flight deck?

The correct answer indicates that there are three crew life vests located on the flight deck. This number is typically determined by safety regulations and requirements for flight operations, ensuring that sufficient safety equipment is available for all crew members on duty during a flight. Having three life vests allows for situations where multiple crew members may need to evacuate or rely on personal flotation devices in an emergency scenario. The specific count is vital for preparedness and aligns with protocols to enhance safety in aviation operations.