A swimmer dives into the shallow end of the pool, strikes their head, and is now seen floating face-down and motionless. Upon entering the water and reaching the casualty, what is the lifeguard's most immediate priority?
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A
To turn the casualty face-up while minimising spinal movement to assess their airway and breathing.
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B
To immediately tow the casualty to the poolside for rapid extraction.
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C
To apply a rescue tube under their shoulders for buoyancy before taking any other action.
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D
To wait for the rescue board to arrive before making any contact with the casualty.