The code which uses 7 bits to represent a character is
Explanation: Basic ASCII encodes 128 specified characters and thus use 7 bits to represent each of these characters whereas Extended ASCII needs 8-bit for each character representation as it has a total set of 256 characters.
Extended Binary Coded Decimal Interchange Code (EBCDIC) is an 8-bit binary code for numeric and alphanumeric characters.
BCD encoding uses 4 bits to represent each digit from the range 0 to 9 in its binary form.
In case of Gray codes, any number of bits can be used to represent a character, according to the requirement.
So, Option (A) is correct.
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