Why Digital Is Clearer Practice Test

An analog signal and a digital signal are both sent through the same noisy channel. The analog signal is a continuous wave, so any added noise changes the exact shape. The digital signal is made of 0s and 1s and the receiver uses a threshold to decide which one was sent. What feature of digital signals makes this threshold method possible?

A student says, “If a digital message travels far enough, it will eventually pick up some noise. So digital and analog must end up equally unclear.” Which response best explains why digital is often clearer anyway in real communication systems?