For all real values of x, the range of the function f(x)=x2+2x+42x2+4x+9f(x)=\frac{x^{2}+2x+4}{2x^{2}+4x+9}f(x)=2x2+4x+9x2+2x+4 is:
[49,89][\frac{4}{9},\frac{8}{9}][94,98]
[37,89)[\frac{3}{7},\frac{8}{9})[73,98)
(37,12)(\frac{3}{7},\frac{1}{2})(73,21)
[37,12)[\frac{3}{7},\frac{1}{2})[73,21)
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