Compare Digital and Analog Signals Practice Test

A student sketches two waveforms: one is a smooth curve that can take any intermediate value (analog), and the other switches between two voltage levels representing 0 and 1 (digital). The student then adds a small amount of random electrical noise to both. Which statement best describes why digital communication is often more noise-resistant?

A musician makes copies of a recording. When copying an analog cassette tape to another tape repeatedly, each generation sounds noisier and duller. When copying a digital audio file repeatedly, each copy sounds identical to the original (assuming error-free copying). What is the best reason for this difference?