Convert the given complex number in polar form :$\;-3$

Question

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