The formula for finding the value of $D$ (discriminant) for a quadratic equation $ax^2 + bx + c = 0$ is $\ldots \ldots \ldots \ldots.$
- A$D = b^2 + 4ac$
- B$D = b^2 - 4a^2c^2$
- C$D = b^2 - 4ac$
- D$D = b^2 + 4a^2c^2$
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