In the event that the lifeguard is the sole staff member on duty, what must they be able to do?

The correct answer highlights the critical importance of communication and alerting others in emergency situations. When a lifeguard is the sole staff member on duty, their primary responsibility is to ensure the safety of all patrons. This includes being prepared to alert additional personnel or emergency services if needed.

Being able to call for help using an alarm system is crucial because a lifeguard alone may not be able to manage an emergency situation effectively without assistance. Quick and effective communication can significantly impact the outcome of any emergency, making it essential for a lifeguard to have the means to call for help when they are the only staff on duty.

While knowing CPR, being able to swim the length of the pool, and documenting incident reports are all important skills for a lifeguard, they do not address the immediate need for assistance in a critical moment when only one person is present. The ability to summon help stands out as the most vital action in such a scenario.