Convert the Given Rectangular Coordinates to Polar Coordinates $0 \leq \theta < 2 \pi$

Multiple Choice

Convert the given rectangular coordinates to polar coordinates. Express the answer in such a way that r is nonnegative and $0 \leq \theta < 2 \pi$ . $( 7,0 )$

A) $( 0,7 )$
B) $( 7,0 )$
C) $\left( - 7 , \frac { 3 \pi } { 2 } \right)$
D) $( - 7,0 )$
E) $\left( 7 , \frac { 3 \pi } { 2 } \right)$