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 statements above, if true, most strongly support which one of the following? ['Digital systems are the best information systems because error cannot occur in the emission of digital signals.', 'Analog representation of information is impractical because we do not need infinitely detailed information.', 'Many ideas that work well in theory do not work well in practice.', 'Digital systems are preferable to analog systems when the signal must be reproduced many times.']