Which of the following is NOT considered an information security breach?

The choice of regular monitoring of information systems as the answer is correct because routine monitoring is a proactive security measure rather than a breach. Information security breaches generally involve unauthorized access, disclosure, or loss of sensitive information, which can occur through various means—such as unauthorized access to classified data, physical theft of access badges, or accidental sharing of sensitive data via email. In contrast, regular monitoring is a standard practice within an organization's security framework aimed at detecting and responding to potential threats, ensuring that the information systems remain secure and that any anomalies are investigated promptly. Thus, monitoring does not constitute a breach but rather plays a crucial role in preventing them.