C-09-Q120mediumsingle_mcqRange of f(x)=logaxf(x) = \log_a xf(x)=logax is:a(0,∞)(0, \infty)(0,∞)b[0,∞)[0, \infty)[0,∞)c(−∞,∞)(-\infty, \infty)(−∞,∞)d{−1,1}\{-1, 1\}{−1,1}