Which of the following accurately describes Base 2?

Base 2, also known as the binary numbering system, accurately describes a system that only uses the digits 0 and 1. This is fundamental to how binary numbers work, as each digit in a binary number represents a power of 2, and only these two digits are employed to construct any number within this system.

For example, the binary number 101 in Base 2 can be interpreted as 1*(2^2) + 0*(2^1) + 1*(2^0), which equates to 4 + 0 + 1, resulting in the decimal value 5. The simplicity of having only two digits makes binary efficient for computer systems, as it aligns perfectly with the on/off states found in electronic circuits.

Other options do not define Base 2 correctly. A system using digits 0 to 5 would represent Base 6, while a system including both positive and negative numbers refers more to signed numbers or possibly the representation of numbers in systems like Two's Complement. Lastly, the decimal system, which is Base 10, is what we commonly use in everyday counting and involves digits from 0 to 9.