A \( \frac{1}{8a} \sec^4 \frac{\theta}{2} \)
B \( \frac{1}{4a} \sec^4 \frac{\theta}{2} \)
C \( 8a \sec^4 \frac{\theta}{2} \)
D \( \frac{1}{4a} \cos^4 \frac{\theta}{2} \)
E \( \frac{1}{8a} \cos^4 \frac{\theta}{2} \)
Correct Answer: Option B
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