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If \( \mathrm{p}, \mathrm{q} \) are the segments of \( a \) focal chord of an ellipse \( b^{2} x^{2}+a^{2} y^{2}=a^{2} b^{2}(ab) \), then
(A) \( a^{2}(p+q)=2 b p q \)
(B) \( b^{2}(p+q)=2 a(p q) \)
\( \mathrm{P} \)
(C) \( a(p+q)=2 b^{2} p q \)
(D) \( b(p+q)=2 a^{2} p q \)
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