When responding to a motion sensor alarm and finding helium balloons, what should the security guard do next?

In the scenario where a security guard discovers helium balloons after responding to a motion sensor alarm, the most appropriate action is to remove the balloons, leave a notice, and reset the alarm.

Removing the balloons is essential because they are likely the cause of the motion detection, and leaving them unaddressed could lead to repeated false alarms. Notifying others by leaving a notice helps ensure that the situation is documented for future reference and informs anyone else who may respond that the balloons were the source of the alarm. Resetting the alarm afterward is crucial to resume normal operations and prevent unnecessary responses to a non-threat.

The other options may not adequately address the situation. Simply leaving the area and resetting the alarm risks allowing the balloons to continue triggering alarms, leading to further disruptions. Deciding not to activate the sensor and leaving might also ignore the underlying issue of false alarms caused by the balloons. Deflating and disposing of the balloons adds unnecessary steps without the need for notification, and resetting the alarm would be important regardless, but it’s vital to consider communication with others about the found condition, hence the chosen answer is more comprehensive and effective.