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If the lengths of the tangents drawn fro...

If the lengths of the tangents drawn from P to the circles `x^2+y^2-2x+4y-20=0` and `x^2+y^2-2x-8y+1=0` are in the ratio `2:1`, then the locus of P is

A

`x^2+y^2+2x+12y+8=0`

B

`x^2+y^2-2x+12y+8=0`

C

`x^2+y^2+2x-12y+8=0`

D

`x^2+y^2-2x-12y+8=0`

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