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Tangent to the parabola y=x^(2)+ax+1 at ...

Tangent to the parabola `y=x^(2)+ax+1` at the point of intersection of the y-axis also touches the circle `x^(2)+y^(2)=r^(2)`. Also, no point of the parabola is below the x-axis.
The radius of circle when a attains its maximum value is

A

1

B

3

C

5

D

7

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The correct Answer is:
A
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