Which of the following is true for the coefficients and constant term of a quadratic equation $ax^2 + bx + c = 0$?
- A$a = 0, b \neq 0, c \neq 0$
- B$a = 0, b \neq 0, c = 0$
- C$a = 0, b = 0, c \neq 0$
- D$a \neq 0; a, b, c \in R$
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