Find the Product A) $- 10 \sqrt { 3 } + 10 \mathrm { i }$

Find the product. Write the product in rectangular form, using exact values.
-[4 $\left. \left( \cos 30 ^ { \circ } + i \sin 30 ^ { \circ } \right) \right] \left[ 5 \left( \cos 120 ^ { \circ } + i \sin 120 ^ { \circ } \right) \right]$

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

Correct Answer:

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