Which of the following line is a diamete...

Which of the following line is a diameter of the circel `x ^(2) + y^(2) -6x-8y-9=0` ?

A

`3x- 4y= 0`

B

`4x- 3y= 9`

C

`x+y= 7`

D

`x- y=1`

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The correct Answer is:

C

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