Which of the following is NOT one of the endings used in radio communications?

• A. Out
• B. Over
• C. Out to you
• D. Over and Out

Answer: (D)

Endings in radio communications tell the other station what your status is—whether you expect a response or you’re finished speaking. Saying “Over” means you’ve finished speaking and are waiting for the other person to reply. Saying “Out” means you’re finished and do not expect a reply. The phrase “Over and Out” mixes these two opposite intents, which creates confusion about whether a reply is still expected. In proper radio practice you don’t use both at once; you use one or the other depending on whether you want a response or to end the transmission. That’s why this ending isn’t used. The other endings are valid when used individually: “Over” to invite a response, and “Out” to indicate you’re done. The expression “Out to you” isn’t a standard formal closing in typical radio procedures, so it isn’t relied upon as a recognized ending.