The locus of the point of intersection of the straight lines \( \frac{x}{a}+\frac{y}{b}=\lambda ...

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The locus of the point of intersection of the straight lines \( \frac{x}{a}+\frac{y}{b}=\lambda \) and \( \frac{x}{a}-\frac{y}{b}=\frac{1}{\lambda}(\lambda \) is a variable \( ) \), is
(A) a circle
(B) an ellipse
(C) a parabola
(D) a hyperbola
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