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PQ is a normal chord of the parabola y^2...

`PQ` is a normal chord of the parabola `y^2= 4ax` at `P,A` being the vertex of the parabola. Through P a line is drawn parallel to `AQ` meeting the x-axis in R. Then the length of `AR` is : (A) equal to the length of the latus rectum (B) equal to the focal distance of the point P (C) equal to the twice of the focal distance of the point P (D) equal to the distance of the point P from the directrix.

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