Which of the following is considered key information obtained from a security audit trail analysis?

The key information obtained from a security audit trail analysis primarily focuses on monitoring and evaluating access attempts to security objects. Specifically, the successful and unsuccessful access attempts can reveal potential vulnerabilities in the system. Unsuccessful accesses are particularly critical since they could indicate unauthorized attempts to breach security protocols, pointing to areas that may require enhanced protective measures. This analysis allows organizations to identify trends in attempted intrusions, manage risks more effectively, and strengthen their defenses against future threats.

While other options provide valuable information, they do not directly relate to the primary purpose of an audit trail analysis, which is to track access and security events. For example, successful communication with external partners, although important, does not pertain to tracking security events. An inventory of cybersecurity equipment is useful for managing resources but does not reflect real-time security status. Similarly, costs associated with security breaches offer financial insights but do not directly inform about security event access patterns. Thus, focusing on unsuccessful accesses allows for a proactive approach to identifying and addressing security risks.