What equipment should a lifeguard have readily available?

A lifeguard should be equipped with a rescue buoy, first aid kit, Automated External Defibrillator (AED), and communication devices to ensure they are fully prepared for a variety of emergency situations. The rescue buoy aids in effective rescues, allowing the lifeguard to provide flotation support to distressed swimmers while remaining safe themselves. The first aid kit is essential for treating injuries that may occur within the facility or during rescue operations. An AED is a critical tool for responding to cardiac emergencies, as it can provide lifesaving shocks to restore heart rhythm. Communication devices, such as radios or mobile phones, are vital for coordinating rescue efforts and alerting other emergency services if needed.

While some of the other options mention specific items that can be beneficial in certain scenarios, they do not encompass the comprehensive range of equipment necessary for effective lifeguarding duties. For example, swim gear, towels, and sunscreen are useful for personal comfort and safety but are not crucial for performing lifesaving duties. Similarly, while a flashlight may be helpful in specific conditions, it is not as universally applicable as the complete set of equipment outlined in the correct answer.