Find the Product $300 ^ { \circ }$ ] [5 $\left. \operatorname { cis } 120 ^ { \circ } \right]$

Find the product. Write the product in rectangular form, using exact values.
-[4 cis $300 ^ { \circ }$ ] [5 $\left. \operatorname { cis } 120 ^ { \circ } \right]$

A) $- 10 - 10 \sqrt { 3 } \mathrm { i }$
B) $10 + 10 \sqrt { 3 } i$
C) $10 \sqrt { 3 } - 10 \mathrm { i }$
D) $- 10 \sqrt { 3 } + 10 \mathrm { i }$

Correct Answer:

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