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A circle S= 0 passes through the common ...

A circle `S= 0` passes through the common points of family of circles `x^2 +y^2 +lambdax-4y +3=0` and `(lambda epsilon R)` has minimum area then (A) area of `S = 0` is `pi` sq. units (C) radius of director circle of `S = 0` is `1` unit (D) `S = 0` never cuts `|2x|=1` (B) radius of director circle of `S = 0` is `sqrt2`

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