Binary system uses the power of two. The simplest positional number system is the binary system of numeration. There can only be two digits, 0 and 1, in a binary representation of any number since the base or radix of the binary system is 2.
A binary number has been stated using the base 2 numeral system, also known as the binary numeral system, which only employs two symbols, commonly 0 (zero) and 1. (one). With a radix of 2, the base-2 number system is a positional notation. The term "bit" is used to describe each digit.
The decimal number system contains ten distinct digits, 0 to 9. Then, all other numerals are created by adding these ten digits together. The binary numbering system used by computers only has two distinct numbers: 0 and 1.
Hence option D is correct.
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