The ___ belongs to a class of codecs called the minimum-change codes, in which only one bit in the code group changes when going from one step to the next

The ___ belongs to a class of codecs called the minimum-change codes, in which only one bit in the code group changes when going from one step to the next.

a. Morse code
b. BCD code
c. Excess-3 code
d. Gray code

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Answer: d

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