Which of the following best defines the concept of "diversity of defense" in cybersecurity?

The concept of "diversity of defense" in cybersecurity refers to employing multiple security measures to reduce risk. This approach recognizes that no single security solution can address all potential threats, and that a layered defense strategy—often referred to as "defense in depth"—enhances overall security. By diversifying defenses, an organization can better protect itself against a wide range of attacks, as different measures can address different types of vulnerabilities and threats.

For instance, an organization can employ firewalls, intrusion detection systems, antivirus software, and user education programs as part of a comprehensive defense strategy. If one measure fails or is bypassed, others are in place to provide ongoing protection. This multiplicity decreases the chance of a successful breach, as attackers encounter multiple barriers.

The other options reflect singular or limited approaches, which do not embody the proactive and comprehensive nature of diversity of defense. Relying on one security measure or implementing specific updates lacks the necessary breadth to effectively manage today's complex cybersecurity landscape.