If latusrectum of the ellipse \( x^{2} \tan ^{2} \alpha+y^{2} \sec ^{2} \alpha=1 \) is \( 1 / 2 ...

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If latusrectum of the ellipse \( x^{2} \tan ^{2} \alpha+y^{2} \sec ^{2} \alpha=1 \) is \( 1 / 2 \), then \( \alpha(0\alpha\pi) \) is equal to
\( \mathrm{P} \)
(a) \( \pi / 12 \)
(b) \( \pi / 6 \)
W
(c) \( 5 \pi / 12 \)
(d) \( \pi / 2 \)
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