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The range of parameter ' a ' for which t...

The range of parameter `' a '` for which the variable line `y=2x+a` lies between the circles `x^2+y^2-2x-2y+1=0` and `x^2+y^2-16 x-2y+61=0` without intersecting or touching either circle is (a)`a in (2sqrt(5)-15 ,0)` (b) `a in (-oo, 2sqrt(5)-15,)` (c)`a in (2sqrt(5)-15,-sqrt(5)-1)` (d) `a in (-sqrt(5)-1,oo)`

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