Every transmission should be ended with the words _______________ or ________________.

The correct conclusion for every radio transmission is to end with "over" or "out." When using radio communication, "over" is used to indicate that the speaker has finished their message and is expecting a response. This lets the receiving party know they can speak. Conversely, "out" signifies that the speaker has completed their communication and does not expect a reply. Using these terms correctly is essential for maintaining proper communication protocols, preventing misunderstandings, and ensuring the conversation flows smoothly. The other choices do not reflect standard radio etiquette and may lead to confusion in communication.