$\begin{array}{1 1} (A) \large\frac{\pi}{2}\log\large\frac{1}{2} \\ (B) \large\frac{\pi}{4}\log\large\frac{1}{2} \\(C) \large\frac{\pi}{2}\log 2 \\ (D) \large\frac{\pi}{4}\log 2 \end{array} $