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A tangent is drawn to the ellipse \( \frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}=1 \) at point \( P \) such that it intersect the
P auxiliary circle at points \( A \) and \( B \), if \( S \) and \( S^{\prime} \) are the focii of the ellipse, then the

W minimum value of \( S^{\prime} A+S B \) is
(A) \( b \)
(B) \( 2 b \)
(C) \( 2 a \)
(D) none of these
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