Which of the following is a typical alarm correlation strategy used to manage alarms?

• A. Time-based correlation.
• B. Color-based correlation.
• C. Perimeter-based correlation.
• D. Random correlation.

Answer: (A)

When managing alarms, you want to connect related events into a single incident by looking at how they fit together in time. Time-based correlation uses a defined time window to group alarms that occur close together, so related events are treated as part of one incident rather than separate alerts. This reduces noise, helps you see the sequence of actions, and makes it easier to respond effectively. For example, if a sensor triggers and another nearby sensor in quick succession, time-based correlation links those alarms, signaling a single underlying issue rather than two separate events.

Other approaches don’t provide the same practical linkage. Color-based correlation relies on display cues rather than relationships between events, which doesn’t reliably indicate connection. Perimeter-based correlation focuses on where alarms happen rather than how they relate causally, which can miss interconnected incidents. Random correlation offers no systematic way to relate events and would just create confusion.