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If \( \cos ^{4} \theta \sec ^{2} \alpha, \frac{1}{2} \) and \( \sin ^{4} \theta \operatorname{cosec}^{2} \alpha \) are in \( \mathrm{AP} \), then
\( \mathrm{P} \) \( \cos ^{8} \theta \sec ^{6} \alpha, \frac{1}{2} \) and \( \sin ^{8} \theta \cdot \operatorname{cosec}^{6} \alpha \) are in

W
(a) AP
(b) GP
(c) HP
(d) None of these
\( \cos ^{4} \theta \sec ^{2} \alpha, \frac{1}{2} \) and \( c \)
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