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The difference between the radii of the ...

The difference between the radii of the largest and smallest circles which have their centres on the circumference of the circle `x^2 + y^2 + 2x + 4y -4 = 0` and passes through point (a,b) lying outside the circle is :

A

6

B

`sqrt((a+1)^(2)+(b+2)^(2))`

C

3

D

`sqrt((a+1)^(2)+(b+2)^(2))-3`

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The correct Answer is:
A
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