Which of the following describes wireless media in the context of electronic communication?

Wireless media refers to the transmission of data without the use of physical cables or wires, allowing for communication through the air using electromagnetic waves. This includes various forms of communication technologies such as Wi-Fi, Bluetooth, and cellular systems. The choice indicating "natural parts of the environment" captures the idea that wireless communication relies on the natural dispersion of radio waves through air and other mediums.

Utilizing the environment's natural components—air, atmospheric conditions, etc.—is inherent to how wireless networks function. It emphasizes how such technologies interact with and move through the environment rather than being confined to specific pathways or structures like cables or conduits.

In contrast, the other options mention concrete structures, fiber-optic cables, and installed connections, which pertain to wired communication methods rather than the essence of wireless communication. These focus on physical, tangible infrastructures and do not encapsulate the concept of wireless media, which is fundamentally about transmitting signals through the atmosphere without physical connections.