Find the Product or Quotient, as Indicated $\mathrm { z } _ { 1 }$

Multiple Choice

Find the product or quotient, as indicated. Leave your answer in polar form.
-Find the product of $\mathrm { z } _ { 1 }$ and $\mathrm { z } _ { 2 }$ .
$$z _ { 1 } = 8 \left( \cos \frac { 4 \pi } { 7 } + i \sin \frac { 4 \pi } { 7 } \right) , z _ { 2 } = \frac { 1 } { 5 } \left( \cos \frac { \pi } { 3 } + i \sin \frac { \pi } { 3 } \right)$$

A) $40 \left( \cos \frac { 19 } { 21 } \pi + i \sin \frac { 19 } { 21 } \pi \right)$
B) $\frac { 41 } { 5 } \left( \cos \frac { 4 } { 21 } \pi + i \sin \frac { 4 } { 21 } \pi \right)$
C) $\frac { 8 } { 5 } \left( \cos \frac { 4 } { 21 } \pi + i \sin \frac { 4 } { 21 } \pi \right)$
D) $\frac { 8 } { 5 } \left( \cos \frac { 19 } { 21 } \pi + i \sin \frac { 19 } { 21 } \pi \right)$