The range of the real valued function $f(x) = \sqrt{\frac{x^2+2x+8}{x^2+2x+4}}$ is
- A$\left[\sqrt{\frac{7}{3}}, \infty\right)$
- B$(0, \infty)$
- C$(1, \infty)$
- D$\left(1, \sqrt{\frac{7}{3}}\right]$
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