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Let P(a t^(2), 2 a t), Q, R (a r^(2).2 a...

Let `P(a t^(2), 2 a t)`, Q, `R (a r^(2).2 ar)` be three points on a parabola `y^(2)= 4ax`. If PQ is the focal chord and PK. QR are parallel where the co-ordinates of K is (2a, 0), then the value of r is

A

`(t)/(1-t^(2))`

B

`(1-t^(2))/(t)`

C

`(t^(2)+ 1)/(t)`

D

`(t^(2)-1)/(t)`

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