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The term ‘Mayday’, seen in the news in the context of recent maritime and aviation incidents, refers to:

  1. AAn automated warning system that instantly alerts nearby vessels or air traffic controllers of a sudden loss of engine power.
  2. BAn internationally recognized voice distress signal used to indicate that a vessel or aircraft is facing a grave and imminent danger to life.
  3. CA designated emergency radio frequency used exclusively by coast guards and naval authorities to issue severe weather warnings.
  4. DAn encrypted transponder code utilized by commercial pilots to discreetly signal a hijacking or terror threat to ground control.

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