P is a point 't' on the parabola y^2=4ax...

`P` is a point `'t'` on the parabola `y^2=4ax` and `PQ` is a focal chord. `PT` is a tangent at `P` and `QN` is a normal at `Q`. The minimum distance between `PT` and `QN` is equal to
(A) `0` (B) `a(sqrt(1+t^2)+1/sqrt(1+t^2))`
(C) `(a(t^2+1)^(3/2))/(t^2)` (D) `(asqrt(t^2+1))/(t^2)`

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