What are national security systems primarily concerned with?

National security systems are fundamentally focused on safeguarding the nation's security interests. This encompasses a wide range of activities designed to identify, reduce, and manage risks that may threaten national security. These systems are tasked with protecting critical infrastructure, ensuring the safety of citizens, and preserving the integrity of government operations against various threats, such as terrorism, espionage, and cyberattacks.

By concentrating on mitigating risks in national security, these systems are able to address vulnerabilities and enhance the overall safety and stability of the nation. This involves not just reactionary measures, but also proactive strategies to anticipate potential threats and implement defenses accordingly. In this context, the emphasis on risk mitigation makes answer B the most fitting choice, reflecting the core purpose and goals of national security systems.