Convert the complex number $\;\large\frac{-16}{1+i \sqrt{3}} \;$ into polar form

Question

$(a)\;8(cos \large\frac{2\pi}{3}+ i sin\large\frac{2\pi}{3})\qquad(b)\;8(cos \large\frac{\pi}{5}+ i sin\large\frac{\pi}{5})\qquad(c)\;(cos \large\frac{2\pi}{3}+ i sin\large\frac{2\pi}{3})\qquad(d)\;0$