The equation of the normal to the parabola $y^{2} = x + a$ with slope $m$ is .....
- A$y = mx - am - am^{3}$
- B$y = mx - 2am - am^{3}$
- C$4y = 4mx + 4am - 2m - m^{3}$
- D$4y = 4mx + 2am - am^{3}$
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