What is a common sign that may indicate espionage activities?

Indicators of espionage are specific signs or patterns of behavior that may suggest the presence of espionage activities. These indicators can include various suspicious actions that deviate from normal operational procedures, such as unauthorized access to sensitive areas, unusual interest in confidential information, or attempts to establish relationships with employees in key positions.

Recognizing these indicators is crucial for early detection and prevention of espionage, as it allows individuals and organizations to take appropriate action to mitigate potential threats. Being vigilant about these signs can help in identifying potential espionage before it escalates into a more significant security risk.

Other choices may encompass observable behaviors and unusual conversations, but they do not capture the broader systematic approach to identifying espionage that 'indicators of espionage' encompasses. Increased security measures may be a reaction to perceived threats but are not, in themselves, an indication of espionage activities.