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The value of lambda for which the circle...

The value of `lambda` for which the circles `x^2 + y^2 = 1 and x^2 + y^2 - 4lambdax+8=0` have only two common tangetns, is : (A) `(- 9/4, 9/4)` (B) `(-oo, - 9/4)] uu [9/4, oo)` (C) `(-oo, - 9/4] uu [9/4, oo)` (D) none of these

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