Which of the following safety equipment is essential for a lifeguard?

The essential safety equipment for a lifeguard is a rescue tube. This buoyant device is designed to assist in the rescue of people in distress in the water. It allows lifeguards to reach individuals without putting themselves at significant risk, as it provides both a flotation device for the victim and a means for the lifeguard to pull them to safety. The rescue tube enhances the lifeguard's ability to perform effective rescues and is considered a fundamental piece of equipment in any lifeguard's toolkit.

While whistles are also important for signaling and communication, they do not provide physical support to a drowning or distressed swimmer. Beach umbrellas and chairs, although helpful for lifeguard comfort and providing shade, are not directly related to life-saving functions and the core responsibilities of a lifeguard in ensuring water safety. Therefore, the rescue tube stands out as the most critical piece of equipment for lifeguards in carrying out their duties effectively.