If \( \frac{\sin ^{2} \alpha-3 \sin \alpha+2}{\cos ^{2} \alpha}=1 \), then \( \alpha \) can be (...

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If \( \frac{\sin ^{2} \alpha-3 \sin \alpha+2}{\cos ^{2} \alpha}=1 \), then \( \alpha \) can be
(a) \( 60^{\circ} \)
(b) \( 45^{\circ} \)
(c) \( 0^{\circ} \)
(d) \( 30^{\circ} \)
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