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.\(\left\{ \begin{array}{l}a > 0\\\Delta  \le 0\end{array} \right.\)

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