If $y = a + bx^2$,where $a$ and $b$ are arbitrary constants,then which of the following is true?

  • A
    $\frac{d^2y}{dx^2} = 2xy$
  • B
    $x\frac{d^2y}{dx^2} = \frac{dy}{dx}$
  • C
    $x\frac{d^2y}{dx^2} - \frac{dy}{dx} + y = 0$
  • D
    $x\frac{d^2y}{dx^2} = 2xy$

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