Find the modulus and the argument of the complex number $\;z=-\normalsize 1- \normalsize i\sqrt{3}$

Question

$(a)\;-\large\frac{2 \pi}{3}\qquad(b)\;-\large\frac{4 \pi}{3}\qquad(c)\;-\large\frac{ \pi}{3}\qquad(d)\;-\large\frac{ \pi}{2}$