The normal form of the equation of a straight line is $x \cos \alpha + y \sin \alpha = p$. Find the differential equation of the family of all such lines where $p$ and $\alpha$ are arbitrary constants.

  • A
    $\frac{d^2y}{dx^2} = 0$
  • B
    $\frac{dy}{dx} = 0$
  • C
    $\frac{dy}{dx} = - \cot \alpha$
  • D
    $\frac{d^2y}{dx^2} = \csc^2 \alpha$

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