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If the focal distance of an end of the minor axis of an ellipse (referred to its axes as the axes of \( x \) and \( y \) respectively) is \( k \) and the distance between its foci is \( 2 h \), then its equation, is
(A) \( \frac{x^{2}}{k^{2}}+\frac{y^{2}}{h^{2}}=1 \)
(B) \( \frac{x^{2}}{k^{2}}+\frac{y^{2}}{h^{2}-k^{2}}=1 \)
(C) \( \frac{x^{2}}{k^{2}}+\frac{y^{2}}{k^{2}-h^{2}}=1 \)
(D) \( \frac{x^{2}}{k^{2}}+\frac{y^{2}}{k^{2}+h^{2}}=1 \)
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