For a return to zero data format ________
A) the format is meaningless because there is no return to zero data format
B) a single pulse during a bit time represents a 0 and absence of a pulse represents a 1
C) a change during a bit time represents a 1 and no change represents a 0
D) a single pulse during a bit time represents a 1 and absence of a pulse represents a 0
D
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