What security measures are put in place at O'Hare to enhance passenger safety?

The chosen answer emphasizes the implementation of advanced screening technologies and thorough personnel training, which are crucial components in modern airport security operations. Advanced screening technologies, such as sophisticated imaging systems and explosive detection technology, significantly improve the ability to identify potential threats in luggage and on passengers without causing unnecessary delays. This use of technology is complemented by well-trained personnel who are equipped with the skills to operate these systems effectively, assess situations, and respond appropriately to security challenges.

In contrast, while the other options include various security measures, they may not represent the most comprehensive or state-of-the-art approaches to security in a large international airport like O'Hare. For instance, manual bag checks and metal detectors provide layers of security, but they may lack the efficiency and thoroughness of advanced technology, especially in high-traffic environments. Increased staff presence and baggage restrictions can enhance security but do not necessarily maximize threat detection capabilities. Similarly, random search protocols and heightened security alerts can serve as effective deterrents, but they may not be as proactive or efficient in identifying potential threats compared to the advantages that advanced technology offers when paired with skilled personnel.