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A common tangent is drawn to the circle ...

A common tangent is drawn to the circle `x^2+y^2=a^2` and the parabola `y^2=4bx`. If the angle which his tangent makes with the axis of x is `pi/4` , then the relationship between a and b (a,b`gt`0)

A

A. `b=sqrt2a`

B

B. `a=bsqrt2`

C

C. c=2a

D

D. a=2c

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The correct Answer is:
A
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