If the normals to the parabola y^2=4a x ...

If the normals to the parabola `y^2=4a x` at the ends of the latus rectum meet the parabola at `Q and Q^(prime),` then `Q Q^(prime)` is `(a)10 a` (b) `4a` (c) `20 a` (d) `12 a`

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