Final answer:
The correct answer answer is 30 seconds, as a quick response is critical to increase the chances of a successful rescue in drowning incidents.
Step-by-step explanation:
The size and shape of a lifeguard's zone should allow them to recognize and reach a victim in the furthest and deepest part of their zone within 30 seconds. This is crucial because in drowning situations, every second counts.
The sooner a lifeguard can respond, the greater the chances of a successful rescue and recovery. It's important to note that, according to water rescue guidelines and considering the urgency of preventing brain damage due to lack of oxygen, a quick response time is essential.
Lifeguards are trained to efficiently survey their designated areas and provide rapid assistance to ensure the safety of all swimmers in their zones.