Give All Solutions of the Nonlinear System of Equations, Including $\begin{array} { l } 3 x ^ { 2 } + 3 y ^ { 2 } = 20 \\6 x ^ { 2 } + 6 y ^ { 2 } = 48\end{array}$

Multiple Choice

Give all solutions of the nonlinear system of equations, including those with nonreal complex components.
$\begin{array} { l } 3 x ^ { 2 } + 3 y ^ { 2 } = 20 \\6 x ^ { 2 } + 6 y ^ { 2 } = 48\end{array}$

A) {(2i, 2i) , (2i, -2i) , (-2i,2i) ,(-2i,-2i) }
B) {(2,2) ,(-2,-2) }
C) $\varnothing$
D) {(2,2) ,(2,-2) ,(-2,2) ,(-2,-2) }