Find the range of f(x)=4x4x+2f(x) = \frac{4^x}{4^x + 2}f(x)=4x+24x.
(0,1)(0, 1)(0,1)
(0,2)(0, 2)(0,2)
(1,∞)(1, \infty)(1,∞)
(0,4)(0, 4)(0,4)