Which of the following is an advantage of radio communications?

• A. No physical connections
• B. Quick setup
• C. Mobile
• D. Signals carry over enemy territory

Answer: (A)

The main idea here is that radio communications don’t need physical connections to work. Because there are no wires or cables linking devices, you can establish links between distant points without laying infrastructure, which makes setup faster and operation possible in remote, disaster-area, or rapidly changing environments.

That’s why the lack of physical connections is the best answer. While quick setup and mobility are useful benefits of wireless communication, they stem from the same wireless nature, and signals traversing enemy territory is not an advantage at all—it's a risk of interception and jamming.