The differential equation for which $y = ax^2 + bx + c$ is the general solution is:

  • A
    $\frac{d^4 y}{d x^4} = 0$
  • B
    $\frac{d^3 y}{d x^3} = 0$
  • C
    $\frac{d^5 y}{d x^5} = 0$
  • D
    $\frac{d^3 y}{d x^3} + \frac{d^4 y}{d x^4} = 0$

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