Write the Complex Number in the Form a + Bi $3 \left( \cos 270 ^ { \circ } + i \sin 270 ^ { \circ } \right)$

Multiple Choice

Write the complex number in the form a + bi.
- $3 \left( \cos 270 ^ { \circ } + i \sin 270 ^ { \circ } \right)$

A) $- 3 \mathrm { i }$
B) 3
C) $- 3$
D) $3 \mathrm { i }$