If $\overrightarrow{a}+{b}+{c}=0,|\overrightarrow{a}|=3, |\overrightarrow{b}|=4,|\overrightarrow{c}|=5$ then the angle between $\overrightarrow{a}$ and $\overrightarrow{b}$ is

Question

$$\begin{array} {1 1}(1)\frac{\pi}{6} &(2)\frac{2\pi}{3}\\(3)\frac{5\pi}{3}&(4)\frac{\pi}{2}\end{array}$$