In communication theory,noise is a technical term for anything that interferes with accurate transmission of a message. It may be physical sounds,technical faults or even faulty handwriting. Such interference distorts or masks the intended meaning. Therefore,the unwanted factors mentioned in the stem are collectively called noise.
Option A:
Channel refers to the medium that carries the message,such as airwaves,cables or paper. While noise may affect a channel,the channel itself is not the source of distortion. Hence this option does not match the stem.
Option B:
Feedback is the receiverβs response that returns to the sender and helps evaluate effectiveness. It is not an interfering element and therefore is the opposite of what the stem describes.
Option C:
Redundancy refers to repetition or extra signals built into a message to make it more robust,not to interference. Often redundancy helps overcome noise rather than causing it. So it does not fit the idea of unwanted disturbance.
Option D:
Noise explains why even carefully encoded messages may be misunderstood,because the signal gets disturbed on the way to the receiver,making option D correct.
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