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If y+c=0 is a tangent to the circle x^2+...

If `y+c=0` is a tangent to the circle `x^2+y^2-6x-2y+1=0` at (a,4) then

A

`ac=360`

B

`ac=-12`

C

`a+c=0`

D

`4a=c`

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