The co-ordinates of the point from where...

The co-ordinates of the point from where the tangents are drawn to the circles, `x^2+y^2=1`, `x^2+y^2+8x+15=0` and `x^2+y^2+10y+24=0` are of same length, are

A

`(2,5/2)`

B

`(-2,-5/2)`

C

`(-2,5/2)`

D

`(2,-5/2)`

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