What are the basic components of a communication system?

The basic components of a communication system typically include a transmitter, receiver, media, and signal. The transmitter is responsible for converting information into signals, while the receiver does the opposite, converting those signals back into usable information. The media serves as the pathway that carries the signals from the transmitter to the receiver.

In the context of option C, although it includes the receiver and transmitter, it lacks other essential elements like the media and the signal. These two missing components are crucial for a complete communication system. Without the media, there would be no means to convey the signals, and without the actual signals, the information could not be transmitted or received effectively.

Therefore, the complete understanding of a communication system requires recognizing all of these fundamental components. The other options highlight different combinations of aspects involved in communication but do not encompass all the necessary elements in a comprehensive manner.