Hệ phương trình \(\left\{ \begin{array}{l}x + y + xy = 11\\{x^2} + {y^2} + 3\left( {x + y} \right) = 28\end{array} \right.\) có nghiệm là:
A.\(\left( {3;2} \right),\,\,\left( {2;3} \right)\)
B.\(\left( { - 3; - 7} \right),\left( { - 7; - 3} \right)\)
C.\(\left( {3;2} \right),\,\,\left( { - 3; - 7} \right)\)
D.\(\left( {3;2} \right),\,\,\left( {2;3} \right),\,\,\left( { - 3; - 7} \right),\,\,\left( { - 7; - 3} \right)\)