Consider the quartic function $h\left(x\right)$ with its second derivative given by $h^{\prime \prime }\left(x\right)=(x+6)(x-5)$. Find the $x$-values where the graph of $h\left(x\right)$ has an inflection point.

• A. $x=-6$
• B. $x=-5\text{ and }x=6$
• C. $x=-6\text{ and }x=5$
• D. $x=5$