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Let A, B be two distinct points on the p...

Let A, 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 diameter, the slope of the line AB is

A

`-(1)/(r)`

B

`(1)/(r)`

C

`(2)/(r)`

D

`-(2)/(r)`

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The correct Answer is:
B
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