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 $\mathrm { z } _ { 2 }$ .
$$z _ { 1 } = 7 \left( \cos \frac { 5 \pi } { 4 } + i \sin \frac { 5 \pi } { 4 } \right) , z _ { 2 } = 5 \left( \cos \frac { 2 \pi } { 3 } + i \sin \frac { 2 \pi } { 3 } \right)$$

A) $35 \left( \cos \frac { 5 } { 6 } \pi + i \sin \frac { 5 } { 6 } \pi \right)$
B) $12 \left( \cos \frac { 23 } { 12 } \pi + i \sin \frac { 23 } { 12 } \pi \right)$
C) $12 \left( \cos \frac { 5 } { 6 } \pi + i \sin \frac { 5 } { 6 } \pi \right)$
D) $35 \left( \cos \frac { 23 } { 12 } \pi + i \sin \frac { 23 } { 12 } \pi \right)$