Which of the following is an indicator of a potential security breach?

Unusual user account activity serves as a key indicator of a potential security breach due to its ability to reveal unauthorized access or malicious actions. For instance, if an account starts accessing data or resources that are inconsistent with the user's normal behavior, it raises alarms about possible compromise. Such activities can include logins from unusual locations, access to sensitive information that the user typically wouldn't handle, or an unexpected spike in file transfers. Recognizing these patterns is crucial for early detection of security incidents, enabling organizations to respond effectively before more significant damage occurs.

In contrast, consistent network speed, regular software updates, and increased storage capacity do not inherently signal a threat. Consistent network performance is desirable as it indicates stable operations. Regular updates are a sign of good security hygiene, reinforcing the integrity of systems, while increased storage capacity reflects growth rather than risk. Therefore, focusing on user activity patterns is essential for identifying potential breaches.