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`

Verified by Experts

The correct Answer is:

B

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