Unauthorized access to devices would most likely indicate which of the following?

Unauthorized access to devices is most closely associated with unauthorized changes. When an attacker gains access to a system, they have the potential to modify system settings, install malicious software, or alter configurations. These changes often occur as a result of exploitation of vulnerabilities or misconfigurations.

Detecting unauthorized changes is crucial for maintaining the integrity and security of systems. Such changes are typically the first indicators of a breach, as they can lead to further attacks, data exfiltration, or disruption of services. Monitoring systems for any alterations that are not performed by authorized personnel can help identify and mitigate threats promptly.

While geographic anomalies, high call volume, and odd network traffic might also hint at security concerns, they do not directly indicate unauthorized access in the same way that unauthorized changes do. Geographic anomalies could suggest suspicious behavior but are not definitive evidence of system compromise. High call volume may pertain more to usage patterns rather than security incidents, and odd network traffic could indicate a potential issue but does not specifically highlight the presence of unauthorized access. Hence, focusing on unauthorized changes provides a clearer link to unauthorized access events.