When troubleshooting a suspected slow gas leak at a high-pressure fitting that is not audible, what is the most reliable and recommended method for precise localization?
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A
Applying an approved, non-corrosive leak detection solution.
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B
Relying solely on the smell of the mercaptan odorant.
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C
Submerging the component in a bucket of water.
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D
Using an ultrasonic leak detector.