Correct Response: B. Since a digital file is merely a series of binary digits, it can be copied many times with very little deviation from the original file. When copying an analog file, there is always some loss of information as well as the addition of some extraneous noise. A natural sound wave is a smooth analog curve. A digital signal can approximate this curve with a very fine step function. But it will never be indistinguishable from a true natural sound wave (A). An analog signal is qualitatively more similar to a natural sound wave but its fidelity to the original is limited by the sensitivity of the recording device and by the level of shielding from outside noise sources. Both analog and digital signals can be transferred electronically (C). A CD is a digital storage device. Therefore, an analog signal cannot be directly stored on a CD (D).
