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Let A and B be two distinct points on th...

Let `A and B` be two distinct points on the parabola `y^2 = 4x`. If the axis of the parabola touches a circle of radius `r` having `AB` as its diameter, then the slope of the line joining `A and B` can be (A) `- 1/r` (B) `1/r` (C) `2/r` (D) `- 2/r`

A

`-1/r`

B

`1/r`

C

`2/r`

D

`-2/r`

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