Second Derivative of a Logarithmic Function

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Let $f$ be the function defined by $f(x)=\ln\left(\frac{x+3}{\sqrt{x+1}}\right)$ . For what value of $x$ is $f''(x)=0$ ?

$x=1+2\sqrt{2}$

$x=1-2\sqrt{2}$

$x=2+\sqrt{2}$

$x=1+\sqrt{2}$

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