What is the first thing a sender must do for their message to be received?

• A. Identify the Medium of Transmission
• B. Determine the Priority of the Message
• C. Confirm Receiver's Address
• D. Encrypt the Message

Answer: (A)

The first thing to do is identify the medium of transmission. This choice determines how the message will actually travel to the receiver—whether over a specific radio channel, a landline, or another data path. If the channel isn’t suitable for reaching the intended recipient, the message can’t be delivered at all, regardless of its content or importance. Once a viable path is established, you can address the message correctly, apply priority handling, and secure it with encryption as needed. Prioritizing the message or encrypting it won’t guarantee delivery if the channel itself isn’t appropriate, and confirming the receiver’s address is only meaningful once you have a usable transmission path.