The equation of a normal to the parabola...

The equation of a normal to the parabola `y=x^(2)-6x+6` which is perpendicular to the line joining the origin to the vertex of the parabola is

A

`4x-4y-11=0`

B

`4x-4y+1=0`

C

`4x-4y-21=0`

D

`4x-4y+21=0`

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The correct Answer is:

C

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