Which is NOT one of the four barriers to communication?

The correct choice indicates a common misunderstanding about the barriers to communication. The designated four barriers typically include issues arising from the sender (such as lack of clarity or misinterpretation), problems with the medium (like technical difficulties or unsuitability of the channel used for communication), and challenges related to feedback (which refers to whether the receiver accurately understands and responds to the message).

While the audience's characteristics can influence the effectiveness of communication, it is not directly categorized as a primary barrier in the formal study of communication barriers. The audience can present challenges like differing backgrounds or biases, but these factors are more related to the context or environment rather than being a standalone barrier like the others mentioned. This distinction is why problems with the audience are not included as one of the main identified barriers.