The equation of a common tangent with positive slope to the circle \( x^{2}+y^{2}-8 x=0 \) as we...

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The equation of a common tangent with positive slope to the circle \( x^{2}+y^{2}-8 x=0 \) as well as to the hyperbola \( \frac{x^{2}}{9}-\frac{y^{2}}{4}=1 \) is
(a) \( 2 x-\sqrt{5} y-20=0 \)
(b) \( 2 x-\sqrt{5} y+4=0 \)
(c) \( 3 x-4 y+8=0 \)
(d) \( 4 x-3 y+4=0 \)
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