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$$k^{2}=m^{2}+n^{2}$$$\newline$For any right triangle, the given equation relates the length of the hypotenuse, $k$, to the lengths of the other two sides of the triangle, $m$ and $n$. Which of the following equations correctly gives $m$ in terms of $k$ and $n$ ?$\newline$Choose $1$ answer:$\newline$(A) $m=k-n$$\newline$(B) $m=\sqrt{k^{2}}-n^{2}$$\newline$(C) $m=\sqrt{k^{2}-n^{2}}$$\newline$(D) $m=\sqrt{k^{2}+n^{2}}$