The equation of the tangent to the parab...

The equation of the tangent to the parabola `y^2=4x` whose slope is positive and which also touches `x^2+y^2=1/2` is

A

y = x + 1

B

y = 2x + 1

C

x + y = 2

D

`y = 4x +1/2`

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The correct Answer is:

A

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