Let $u,v$ and $w$ be vectors such that $u+v+w$. If $|u|=3,|v|=4$ and $||w|=5$. Then the value of $u.v+v.w+w.u$ is

Question

$\begin{array}{1 1} 47 \\ -25 \\ 0 \\ 25 \end{array}$