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Binary number system uses digits:

A0 to F
B0 and 1 (base 2)
C0 to 7
D0 to 9
Answer & Solution
Correct answer: B. 0 and 1 (base 2)
Binary: base 2, digits 0 and 1. Foundation of computer hardware (transistors: on/off). 8 bits = 1 byte. Other systems: octal (base 8, digits 0-7), decimal (base 10), hexadecimal (base 16, 0-9 + A-F).
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