Which of the following is a common security risk associated with mission-critical systems?

A common security risk associated with mission-critical systems is data breaches due to unauthorized access. This is particularly important because mission-critical systems often handle sensitive and vital information that, if compromised, can lead to significant operational disruptions, financial losses, and reputational damage. Unauthorized access can occur through various means, such as exploiting software vulnerabilities, weak authentication mechanisms, or insider threats. Protecting against these risks typically involves robust access control measures, encryption, and regular security audits to ensure that only authorized personnel can access sensitive data and that the system is adequately safeguarded against potential attacks.

While other options describe challenges associated with mission-critical systems—like resource management and training—they do not directly relate to the security aspect as strongly as data breaches do. Understanding the critical nature of data in these environments emphasizes why safeguarding against unauthorized access is paramount.