Find All Solutions of the Equation $$x ^ { 3 } + 8 i = 0$$

Multiple Choice

Find all solutions of the equation. Leave answers in trigonometric form.
- $$x ^ { 3 } + 8 i = 0$$

A) $\left\{ 2 \operatorname { cis } 270 ^ { \circ } , 2 \right.$ cis $\left. 210 ^ { \circ } , 2 \operatorname { cis } 150 ^ { \circ } \right\}$
B) $\left\{ 2 \operatorname { cis } 90 ^ { \circ } , 2 \right.$ cis $210 ^ { \circ } , 2$ cis $\left. 330 ^ { \circ } \right\}$
C) $\left\{ 2 \operatorname { cis } 270 ^ { \circ } , 2 \right.$ cis $30 ^ { \circ } , 2$ cis $\left. 150 ^ { \circ } \right\}$
D) $\left\{ 2 \operatorname { cis } 90 ^ { \circ } , 2 \right.$ cis $150 ^ { \circ } , 2$ cis $\left. 30 ^ { \circ } \right\}$