Theoretically, analog systems are superior to digital systems. A signal in a pure analog system can be infinitely detailed, while digital systems cannot produce signals that are more precise than their digital units. With this theoretical advantage there is a practical disadvantage, however. Since there is no limit on the potential detail of the signal, the duplication of an analog representation allows tiny variations from the original, which are errors. These errors tend to accumulate as signals are duplicated, until this noise obliterates the information embodied in the original signal.
 The statement 'Digital systems are the best information systems because error cannot occur in the emission of digital signals' most strongly supports which one of the following.