A \( \frac{1}{4}(\sqrt{5}+1) \)
B \( \frac{1}{4}(\sqrt{5}-1) \)
C \( \frac{1}{4}\sqrt{10+2\sqrt{5}} \)
D \( \frac{1}{4}\sqrt{10-2\sqrt{5}} \)
Correct Answer: Option A
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