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If a normal chord of a parabola y^(2) =...

If a normal chord of a parabola `y^(2) = 4ax` subtends a right angle at the origin, then the slope of that normal chord is

A

`+-2`

B

`+-2 sqrt2`

C

`+-(1)/(sqrt2)`

D

`+-sqrt2`

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The correct Answer is:
D
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