A common tangent to the circle x^2 +y^2=...

A common tangent to the circle `x^2 +y^2=4` and `(x-3)^2+y^2=1` is

A

1) `x=4`

B

2) `y=2`

C

3) `x+sqrt3y=4`

D

4) `x+2sqrt2y=6`

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