This system requires giving different codes to all characters in 5 bits. Thus, option "A" is correct.
A bit is a binary digit, the most smallish increment of data on a computer. A bit can have only one of two values: 0 or 1, compared to the electrical values of off or on, respectively. Because bits are so small, you rarely work with data one bit at a time.
Thus, option "A" is correct.
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