If the semi-circular contour D of radius 2 is as shown in the figure, then the value of the integral _ D 1 ( s^2 - 1 ) ds is

If the semi-circular contour D of radius 2 is as shown in the figure, then the value of the integral $$\underset{\text{D}}{\oint }\frac{1}{\left({\text{s}}^2-1\right)}\text{ds}$$   is

Answer: Option A