A pool rack has 3 straight sides of length 12 cm each, rounded ** by three circular arcs each of 3 cms radius as shown in the figure. If the area inside the rack can be expressed as απ + b√*3+ c, where a, b, c are whole numbers, then the value of (a + b + c), is
(A) 36
(B) 108
(C) 144
(D) 153
