lf a circle C passing through (4,0) touc...

lf a circle `C` passing through `(4,0)` touches the circle `x^2 + y^2 + 4x-6y-12 = 0` externally at a point `(1, -1),` then the radius of the circle `C` is :-

A

`sqrt(57)`

B

4

C

`2sqrt(5)`

D

5

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The correct Answer is:

D

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