Upon arriving at a domestic property, you immediately smell gas. What is the first and most critical action you should take?
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A
Perform a tightness test on the gas installation.
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B
Turn off the gas at the emergency control valve (ECV) and ventilate the property.
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C
Identify the source of the leak using leak detection fluid.
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D
Immediately call the National Gas Emergency Service and await their arrival before taking any action.