Which of the following is considered a nuisance alarm?

A nuisance alarm refers to an alarm that is triggered by non-emergency situations or minor incidents that do not pose a significant threat to life or property. In this context, system activation due to cooking smoke is characterized as a nuisance alarm because it typically involves the alarm being set off by everyday cooking activities that generate smoke but do not indicate an actual fire situation. Such alarms are common in residential and commercial settings where cooking is taking place and can lead to alarm fatigue if they occur frequently.

Other scenarios presented, such as fires due to electrical failure, spontaneous flooding alarms, and false alarms triggered by fireworks smoke, indicate situations that may involve genuine emergencies or safety concerns, which do not fit the definition of a nuisance alarm. These events have more serious implications and usually require a responsive action by emergency services.