If f(x)=log2(x)f(x) = \log_2(x)f(x)=log2(x), what is the domain of fff?
All real numbers
(0,∞)(0, \infty)(0,∞)
[0,∞)[0, \infty)[0,∞)
[−∞,0)[-\infty, 0)[−∞,0)