Find the Cartesian Coordinates of the Given Point $\left( 18 \sqrt { 2 } , \frac { \pi } { 4 } \right)$

Multiple Choice

Find the Cartesian coordinates of the given point.
- $\left( 18 \sqrt { 2 } , \frac { \pi } { 4 } \right)$

A) $( 9 \sqrt { 3 } , 9 )$
B) $( 18 \sqrt { 2 } , 18 \sqrt { 2 } )$
C) $( 18,18 )$
D) $( 9 \sqrt { 2 } , 9 \sqrt { 2 } )$