A \( \cos^{- 1}{\left ( \frac{1}{2} \right )} \)
B \( \cos^{- 1}{\left ( \frac{\sqrt{3}}{2} \right )} \)
C \( \sin^{- 1}{\left ( \frac{1}{2} \right )} \)
D None of these
Correct Answer: Option D
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