What role do alarms play in a surveillance system?

In a surveillance system, alarms play a crucial role by informing operators of significant changes or events. This capacity to alert personnel is vital for effective monitoring and response during incidents, such as unauthorized access or anomalies detected by the system. Alarms can be triggered by various parameters, including motion detection, tampering, or environmental changes, enabling a prompt reaction to potentially critical situations. This function enhances situational awareness and allows for timely interventions, which is fundamental to security and surveillance operations.

The other options do not accurately represent the primary function of alarms in a surveillance context. Providing feedback on user activities refers more to user auditing rather than the alarm's purpose. Enhancing color quality pertains to video processing rather than alerts about events, and managing camera angles automatically relates to operational control but does not involve the alert mechanism inherent to alarms.