Give All Solutions of the Nonlinear System of Equations, Including $$\begin{array} { l } x ^ { 2 } + y ^ { 2 } = 90 \\x ^ { 2 } - y ^ { 2 } = 72\end{array}$$

Multiple Choice

Give all solutions of the nonlinear system of equations, including those with nonreal complex components.
- $$\begin{array} { l } x ^ { 2 } + y ^ { 2 } = 90 \\x ^ { 2 } - y ^ { 2 } = 72\end{array}$$

A) $\{ ( 9,3 ) , ( 3,9 ) , ( - 9 , - 3 ) , ( - 3 , - 9 ) \}$
B) $\{ ( 9 , - 3 ) , ( 9,3 ) \}$
C) $\{ ( - 9 , - 3 ) , ( - 3 , - 9 ) \}$
D) $\{ ( 9,3 ) , ( - 9,3 ) , ( 9 , - 3 ) , ( - 9 , - 3 ) \}$