4. Binary is a base of two number system. What does this mean?
A. That there are 10 possible states (0-9)
B. That there are 2 possible states (0, 1)
C. That there are 16 possible states (0-9, A-f)
D. That the computer can only understand letters
Binary number system, in mathematics, positional numeral system employing 2 as the base and so requiring only two different symbols for its digits, 0 and 1, instead of the usual 10 different symbols needed in the decimal system.