The standard form of a quadratic equation in one variable is $\ldots \ldots \ldots \ldots . .$
- A$ax + by + c = 0$
- B$ax^2 + by + c = 0$
- C$ax^2 + bx + c = 0$; where $a \neq 0$; $a, b, c \in R$
- D$ax^2 + bx + c$; where $a \neq 0$; $a, b, c \in R$
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