Which of the following statements about the numbers by which sound is represented in a digital system can be inferred from the passage？

A. They describe the time interval between successive sounds in a passage of music.
B. They model large changes in the amplitude of the initial sound with relatively poor precision.
C. They are slightly altered each time they are read by the playback apparaturs.
D. They are not readily altered by distortion and noise accumulated as the digital signal is stored and manipulated.
E. They are stored in the recording medium in small groups that can be read simultaneously by the playback apparatus.