The standard form of a quadratic polynomial of one variable is $\ldots .$

  • A
    $ax + by + c$
  • B
    $ax^2 + by + c$
  • 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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