Find the Rectangular Coordinates of the Point with the Given $( 5,4 \pi / 3 )$

Find the rectangular coordinates of the point with the given polar coordinates.
- $( 5,4 \pi / 3 )$

A) $\left( \frac { - 5 \sqrt { 3 } } { 2 } , \frac { - 5 } { 2 } \right)$
B) $\left( \frac { 5 } { 2 } , \frac { 5 } { 2 } \right)$
C) $\left( \frac { - 5 } { 2 } , \frac { - 5 \sqrt { 3 } } { 2 } \right)$
D) $\left( \frac { - 5 } { 2 } , \frac { - 5 } { 2 } \right)$