From a point (sintheta,costheta), if thr...

From a point `(sintheta,costheta)`, if three normals can be drawn to the parabola `y^(2)=4ax` then the value of a is

A

`(1/2,1)`

B

`[-1/2,0)`

C

`[1/2,1]`

D

`(-1/2,0)cup(0,1/2)`

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The correct Answer is:

D

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