If \( x=9 \) is the chord of contact of the hyperbola \( x^{2}-y^{2}=9 \), then the equation of ...

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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) \( 9 x^{2}-8 y^{2}+18 x-9=0 \)
(B) \( 9 x^{2}-8 y^{2}-18 x+9=0 \)
(C) \( 9 x^{2}-8 y^{2}-18 x-9=0 \)
(D) \( 9 x^{2}-8 y^{2}+18 x+9=0 \)
\( \mathrm{P} \)
W.
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