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If x= 9 is the chord of contact of the h...

If x= 9 is the chord of contact of the hyperbola `x^2-y^2=9`, then the equation of the corresponding pair of tangents is :

A

`9x^2-8y^2+ 18x-9=0`

B

`9x^2-8y^2- 18x+9=0`

C

`9x^2-8y^2- 18x-9=0`

D

`9x^2-8y^2+ 18x+9=0` .

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