If P(-1, -3) is a centre of similitude f...

If P(-1, -3) is a centre of similitude for the circles `x^(2)+y^(2)=1` and `x^(2)+y^(2)-2x-6y+6=0`, then the length of the common tangent through P to the circles, is

A

`1/3`

B

`4/3`

C

`1`

D

cannot be determined

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The correct Answer is:

C

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