What does the '10/20 protection rule' mean in lifeguarding?
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A
Scan the entire zone within 10 seconds and reach any swimmer in 20 seconds
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B
Take a 10-minute break every 20 minutes of surveillance duty
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C
Maintain a ratio of 10 swimmers per lifeguard in zones under 20 meters
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D
Rotate positions every 10โ20 minutes to maintain alertness