A.\(\left\{ \begin{array}{l}a > 0\\\Delta \le 0\end{array} \right.\)
B.\(\left\{ \begin{array}{l}a > 0\\\Delta \le 0\end{array} \right.\)
C.\(\left\{ \begin{array}{l}a > 0\\\Delta < 0\end{array} \right.\)
D.\(\left\{ \begin{array}{l}a > 0\\\Delta \le 0\end{array} \right.\)