Write the Complex Number in Rectangular Form $3 \operatorname { cis } 240 ^ { \circ }$

Multiple Choice

Write the complex number in rectangular form.
- $3 \operatorname { cis } 240 ^ { \circ }$

A) $- \frac { 3 } { 2 } + \frac { 3 i \sqrt { 3 } } { 2 }$

B) $\frac { 3 } { 2 } - \frac { 3 \mathrm { i } \sqrt { 3 } } { 2 }$

C) $- \frac { 3 } { 2 } - \frac { 3 i \sqrt { 3 } } { 2 }$

D) $\frac { - 3 \sqrt { 3 } } { 2 } - \frac { 3 i } { 2 }$