Which of the following correctly matches the radiotelephony term with its primary purpose?

• A. Securite: distress; Pan Pan: routine traffic; Mayday: safety broadcast
• B. Securite: emergency medical; Pan Pan: safety warnings; Mayday: routine traffic
• C. Securite: routine weather; Pan Pan: safety warnings; Mayday: urgent message
• D. Securite: safety broadcast; Pan Pan: urgent message for safety; Mayday: distress

Answer: (D)

In radiotelephony, three call signals indicate levels of urgency and purpose. Securite is a safety broadcast, used to transmit important safety information such as navigational hazards or weather warnings to mariners. Pan-Pan signals an urgent situation that affects safety and requires prompt attention, but it is not an immediate life-threatening emergency. Mayday is a distress call, used when there is grave danger and immediate rescue is needed.

The best match is Securite: safety broadcast; Pan Pan: urgent message for safety; Mayday: distress. The other options mix up these duties—for example, assigning medical, routine, or weather uses to the terms—so they don’t reflect the established purposes of each radiotelephony term.