In the following figure PQRS is a rectangle with PS and RS equal to 1 and 2 units respectively. Two quarter circles are drawn with centres at Q and P respectively. Now a circle is drawn touching both the quarter circles and done oF the sides of the rectangle. Find the area of the shaded region:

A) 32/115 sq. units
B) 13/56 sq. units
C) 16/83 sq. units
D) 7/20 sq. units