What is the range of f(x)=3x2+4+1f(x) = \frac{3}{x^2+4} + 1f(x)=x2+43+1?
(1,1.75](1, 1.75](1,1.75]
(1,3](1, 3](1,3]
[0,1][0, 1][0,1]
[1,∞)[1, \infty)[1,∞)