1.已知圖中「粗灰線」橢圓的方程式為\( \frac{x^2}{a^2} + \frac{y^2}{b^2} = 1 \),試選出最有可能為圖中「粗黑線」圖形方程式的選項。


(A)\( \frac{x^2}{b^2} + \frac{y^2}{a^2} = 1 \)
(B)\( \frac{x^2}{a^2} - \frac{y^2}{b^2} = 1 \)
(C)\( \frac{x^2}{a^2} - \frac{y^2}{b^2} = -1 \)
(D)\( \frac{x^2}{b^2} - \frac{y^2}{a^2} = 1 \)
(E)\( \frac{x^2}{b^2} - \frac{y^2}{a^2} = -1 \)

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