If \( \sin ^{4} \theta-\cos ^{4} \theta=K^{4} \), then \( \sin ^{2} \theta-\cos ^{2} \theta \) i...

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If \( \sin ^{4} \theta-\cos ^{4} \theta=K^{4} \), then \( \sin ^{2} \theta-\cos ^{2} \theta \) is
(a) \( \mathrm{K}^{4} \)
(b) \( K^{3} \)
(c) \( K^{2} \)
(d) \( K \)
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