Let $P, Q,$ and $R$ be three co-normal points on the parabola $y^2 = 4ax$. Then the correct statement$(s)$ is/are:
- AThe algebraic sum of the slopes of the normals at $P, Q,$ and $R$ vanishes.
- BThe algebraic sum of the ordinates of the points $P, Q,$ and $R$ vanishes.
- CThe centroid of the triangle $PQR$ lies on the axis of the parabola.
- DAll of the above.
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