If \( S \) and \( S^{\prime} \) are two foci of an ellipse \( \frac{x^{2}}{a^{2}}+\frac{y^{2}}{b...

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If \( S \) and \( S^{\prime} \) are two foci of an ellipse \( \frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}=1(ab) \) and \( P\left(x_{1}, y_{1}\right) \) a point on it, then \( S P+S^{\prime} P \) is equal to
(A) \( 2 a \)
(B) \( 2 b \)
(C) \( a+e x_{1} \)
(D) \( b+e y_{1} \)
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