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The centre of an ellipse is \( C \) and \( P N \) is any ordinate
\( \mathrm{P}^{16:} \) and \( A, A^{\prime} \) are the end points of major axis, then the

W value of \( \frac{P N^{2}}{A N \cdot A^{\prime} N} \) is:
(1) \( \frac{b^{2}}{a^{2}} \)
(2) \( \frac{a^{2}}{b^{2}} \)
(3) \( a^{2}+b^{2} \)
(4) 1
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