What is the range of f(x)=log2(x)f(x) = \log_2(x)f(x)=log2(x) for x∈(0,∞)x \in (0, \infty)x∈(0,∞)?
[0,∞)[0, \infty)[0,∞)
All real numbers
(0,∞)(0, \infty)(0,∞)
[1,∞)[1, \infty)[1,∞)